When people talk about air pollution, they are usually thinking about outdoor air    (1)   . But do you know that there is also air pollution inside homes, offices, hotels and other buildings? The air in your home can be 2 to 100 times more polluted than the air outdoors! In fact, some American doctors say that 50% of the illnesses have   (2)     to do with the polluted indoor air.

A lot of pollution comes from indoor activities   (3)   smoking and cooking. As most people    (4)    about 80%-90% of their time inside buildings, it is important to take indoor air pollution seriously, too.

Air pollution influences our health    (5)   . When the air is polluted, not only young children and old people     (6)    from it,  (7)   people with health problems suffer as well. Indoor air pollution can     (8)   people’s eyes, noses and throats. Air pollution, both indoor and outdoor, can also    (9)    lung cancer and heart disease! In the Great London Fog in 1952, 4, 000 people died in a few days    (10)   the pollution! It is said that half a million young children and women die each year in India because of indoor air pollution!

The earth is our home. We must take care of it. Life today is easier than it was   (1)   years ago, but it has brought some new problems. One of the biggest problems is pollution. We can see it, smell it, drink it and even   (2)   it.

Man has polluted the   (3)  . The more people, the more pollution. Many years ago, the problem was not so serious because there were not so   (4)  people. When the land was used up (用光) the river was not clean in a place, man went to   (5)   place. Now man is slowly polluting the whole world.

  (6)   pollution is still the most serious, it’s bad for  (7)  things in the world. Many countries don’t let people burn   (8)  for air in houses and factories in the city. Pollution by SO₂ is now the most dangerous kind of  (9)  pollution. It’s caused by heavy traffic. People say it’s   (10)  to ride bikes. When you are   (11)  , there is no pollution. But even in developed countries, most people don’t go to work by bike. It’s not   (12)  bikes are expensive or people are tiered if they ride to work. It’s because the number of cars on the roads becomes larger. So more people   (13)  their bikes and go to work by cars, then things are getting  (14)  . We should have special roads only for bikes and make it  (15)  difficult and expensive for drivers to take their cars into the city that they will go back to use their bikes.

  There are different kinds of lakes in the world. And there are a few different ways to measure(测量)   (1)   is the world's largest lake. Are you interested in the lake with the largest area or the lake with the   (2)   water？ And， do you want to   (3)   salt water seas with others？ In fact， there are lots of differences between salt water seas and other seas.

    “Which lake is the world's largest？” is not a   (4)   question to answer.   (5)  ， we can discuss the question in a few different and difficult ways.

    Lake Baikal is the world's largest   (6)   water lake with the most water. It has about 5521 km³ of water， or about 20％ Earth's fresh water. This   (7)   is about five times as large as all five of the North American Great Lakes.

    The salty Caspian Sea has the largest salt water area with 370886 km². Lake Superior，   (8)   the United States and Canada is a fresh water lake with the largest area with 82103 km².

    There are also some other interesting lakes in the world. If you want to   (9)   them， you can visit http：//geology.com/records/largest-lake. shtml. It   (10)   lots of funny facts about different kinds of lakes. Have a good time！

It is well known that everyone has his own dream as well as his own future. But do you know what future ___  (1)  ___ is? I have to  ___  (2)  ___ that future is now. That is to say we must treasure every minute now. If we want to have a bright future, we should know how ___  (3)  ___ time is and use it well.

There is an old English saying: “Gain time, gain life.” Then what’s time? Time is something that we can’t see or touch, but we can feel it ___  (4)  ___ by. Time is ___  (5)  ___ with us. When we are at table, time passes; when we play, time goes ___  (6)  ___ unnoticeably. We always say “Time is money”, but time is even more precious(珍贵的)than money, because when money is  ___  (7)  ___ , we can earn it back. But if time is gone away, it will never return. So, some of us even say time is priceless(无价的).

We should always ___  (8)  ___: future is now. For us students, we should try our best to work hard in order to create a great future of our own. We should make the best use of every hour and be the master of today. We should do ___  (9)  ___ as well as possible. And never put off what can be done today till tomorrow.

As we all know, “Time and tide ___  (10)  ___ no man.” If you waste today, you will regret tomorrow. So from now on, work hard. Tomorrow will be better, and your future will be brighter .Remember: “No pains, no gains.” Today’s hard work is the cause of tomorrow’s harvest.

The natural world teaches us a great deal about recycling. In nature, recycling happens everyday. For example, when leaves fall to the ground, they will turn into compost(肥料), helping__36__ grow healthily and strong. When an animal dies, it becomes food for __37__ animals.Nothing is wasted. But humans have created things like plastic bags __38__ can't be broken downby nature.

Our rubbish kills animals and __39__ water and soil. If we continue making too muchrubbish, the problem will only get __40__. If nature can't reuse the rubbish, we__41__recycle it.We should clean up the rubbish we've made because nature can't.

Recycling is important. In reusing material instead of throwing it away, we can also benefitfrom it. __42__ the Earth is rich in natural materials like water and trees, these materials are notendless. We use up our natural materials much __43__ than the Earth is able to reproduce them.For example, each year we cut down more than 6,000 square miles of forest. But it takes anaverage of 25 years for a __44__ tree to grow.

Recycling can help us __45__ the Earth, so let's take action right now.

The summer is coming, and the storms are   (1)  . Though they happen often. some people don't care them, In fact it's very   (2)   for people and it even can make people die at once.

    So how do we keep safe   (3)   a lightning storm?

    If you are indoors, stay away from windows and doors during a lightning storm. Don't take a shower or do some dishes,   (4)  lightning can travel through water.   (5)  the TV and computer. Last time my computer was   (6)  . Never use the phone. Lightning could travel through the phone line and hit you.

    If you are outdoors during a lightning storm .Never take shelter（避雨）under a tree, because the lightning could   (7)  the tree and travel through the tree to hit you. Stay away from   (8)   that is metal. Try to get in you car and close all the windows or going to a   (9)  building. If there's no building around, try to find a   (10)  place to stay in . Squat（蹲）down near the ground and put your hands over your ears.

Japanese scientists have made the world's first news-reading robots. They look and act __36__ humans. They also sounded human and had a sense of humour（幽默）. The scientists __37__ two robots to reporters. One of them is __38__ "Kodomoroid". Both names use __39__ of the English word "android" with the Japanese words for child and adult. The __40__ read news on an imaginary（想象的） earthquake in Tokyo and a raid by the FBI. The robots' creator is a top robotics professor, Hiroshi Ishiguro. He did not say when robots would really read the __41__ on television, but he said it would __42__ in the near future.

Robots are big business in Japan. Many companies __43__ a lot of money on making them. They research（研究） __44__ to make robots better and better. Japanese people have a positive（积极的） image of robots. They think they are __45__ and cute. Westerners think robots are __46__ scary（恐怖的）. They worry that robots will __47__ the world and control us. Professor Ishiguro said: "We will have __48__ robots in our everyday lives in the future." He added that they are now not so __49__. He said: "Robots are now becoming affordable -- not __50__ from owning a laptop（便携式电脑）".

You are standing in the  (1)  and a voice says, “Put a little more salt to that soup.” Yes, it’s always nice to have someone help you when you’re  (2)  .   (3)  this voice is not from a person. Then  (4)  does it come from? Is it from a ghost(鬼)? No, this isn’t a ghost kitchen— it’s the kitchen of the future.

Scientists(科学家) are  (5)  to make everything in the kitchen  (6)  better. They are making a system(系统). It will help  (7)  cook a meal.

The fridge of the smart kitchen has a scanner(扫描仪). It looks  (8)  the foods in the fridge. It will order more milk from the supermarket when there is no more in the fridge. It can do a lot of things. Even the knives and spoons will speak. For example, if your food is   (9)  , the knives and spoons will tell you not to eat it. The future kitchen may look wonderful, but itˈs not cheap. The multimedia (多媒体)fridge  (10)  about 8,000 dollars.

The tigeris the largest wild __  (1)  __ in the world. The big cat weighs about 363 kilograms and is about two meters long.

    Tigers wait __  (2)  __ it is dark, then they go out to find their food. When a tiger sees an animal, it moves very quietly, then jumps on the animal to kill it. Sometimes it can __  (3)  __ several days for a tiger to finish eating its kill(猎物). The tiger eats until it has had enough, then it covers the dead animal __  (4)  __ leaves. Later, when the tiger is __  (5)  __ again, it comes back to eat some more.

   Tigers are different from __  (6)  __ in the cat family: they like water, and they often jump into rivers to swim.

   Sometigerslive in very __  (7)  __ places—in parts of North Korea, eastern Russia, and Northeast China. Other tigers live in warmer places—in India and parts of Southeast Asia.

   All tigersare in danger. People killed them __  (8)  __ their fur(毛皮) for clothes, and their bodies for medicine. There is also __  (9)  __ land for tigers to live on. But now people know that tigers are in danger and have made plans to __  (10)  __ them.

A

Which of your two hands do you use most? Very few of us can use   (1)  of our hands well. Most of us are right-handed. Only about five people out of a hundred are left-handed. New-born babies can hold things with both of their hands,  (2)   in about two years they usually like to use their right hands. Scientists have found that monkeys like to use one of their hands   (3)  than the other, but it can be either hand. There are as many right-handed monkeys as there are left-handed. Most people use their right hands, and this makes life  (4)  for the left -handed people. We live in a   (5)  world.