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            • 1．
              There’s no such thing as living alone. Never mind if you’re   (1)   only person in your house and have no dog, no cat, not even fish. You still have got several billion   (2)  (roommate) — and so do we all. Some of them are harmless, some are   (3)  (actual) helpful and some could even kill you. They are, of course, bacteria, fungi(菌类) and viruses, and like it or not, they’re on you, around you, and deeply within you. The fact that bacteria life is everywhere is not   (4)  (surprise). It’s something you    (5)    (learn) from your childhood when your mother told you not to drink water from someone else’s glass. There are lots of bacteria   (6)   are living in your tea kettle. There are bacteria   (7)   (sleep) with you on your bed. Scientists are beginning   (8)     realize) the richness of the microbiome(微生物群系) — which is as complex as the ones   (9)   (find) in oceans, rainforests, deserts and woodlands. Your house has a microbiome and   (10)     do you.
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            • 2．

              In order to know a foreign language thoroughly, four things are necessary. Firstly, we must understand the language when we hear __  (1)  ____ spoken.. Secondly, we must be able to speak it correctly with confidence and without hesitation. ___  (2)  ___ ,we must be able to read the language , and fourthly, we must be able to write it. We must be able to make sentences that are grammatically correct.

              There is no easy way to success _  (3)  ___ language learning. __  (4)  __ good memory is of great help, but it is not enough only _____  (5)  ___(memorize) rules from a grammar book. It is not much use learning by heart long list of words and ___  (6)  __meaning, studying the dictionary and so on. We must learn by using the language. __  (7)  ___we are satisfied with only a few rules we have memorized, we are not really learning the language. “Learn through use” is a good piece of __  (8)  ___(advise) for those ___  (9)  _are studying a new language. Practice is important. We must practise speaking and ____  (10)  ___(write) the language whenever we can.

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