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请根据首字母和汉语，在空白处填入适当的单词或单词的正确形式。每空一词并将答案包括首字母填写在答题纸标号的相应位置上。
(1).As far as I know，Mark is a c________(谨慎的) shopper who always does some careful research on the market before he buys something valuable.
(2)When he came back three hours later，they were still sitting on the sofa，a________(专注的) in conversation.
(3)Children e________(接触) to the virus can be severely ill.
(4)People who have gone through difficult situations are better at handling those c___________ (具有挑战性的) tasks.
(5)We will have a further discussion before we draw a final c_________(结论)．
(6)The prime minister is making an important a________(通知) at the moment.
(7)Twenty-five thousand deaths per year are caused by air p___________(污染)．
(8)The belief that the world is flat is not s________(科学的)．
(9)The teacher c___(治疗) him of his bad habits，and he made progress in study.
(10)Everyone should take the b_________ (责备) for our community.
(11)D________(划分) into three groups，the students began to discuss the topic .
(12)If it’s c_______(方便的)，call me tomorrow before noon.
(13) I find playing golf a very e___________ (令人愉快的) game.
(14)This is a good chance to go abroad，so she is ________(不愿意的) to give it up.
(15)Another p________(可能性) is that we’ll go to Mexico for further study.
(16)R_____(粗略地) speaking，there were about 100 people attending the meeting.
(17)Can you tell me how many students our class c_________ (组成) of ?
(18)The naughty boy takes d___________ (高兴) in making fun of others.
(19)The young man looks more handsome in u__________ (制服)。
(20)His private c_________ (收藏) is very precious.