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从方框内选择最佳选项完成对话，有两项多余。
Betty：Hi,Tony．What are you up to?
Tony：I'm making a model of the space station． 1
Betty：It's great!I can't imagine you are so clever．
Tony：Thank you．
Betty： 2
Tony：It's for my space travel homework．
Betty：Oh,I see． 3
Tony：Don't worry．Miss Li wants it next month．You have enough time to finish it．
Betty： 4
Tony：For about three days．
Betty：Is it hard?By the way,how do you know so much about space?
Tony：A little hard,but it is interesting． 5
Betty：May I borrow your book?
Tony：Of course．I'll give it to you tomorrow morning．
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2．________
3．________
4．________
5．________
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