There are many helpful inventions around us.Choose one you're familiar with and introduce its history to your partner.
10.( ) A. happy B. interested C. helpful D. healthy
9.( ) A. open B. close C. draw D. use
8.( ) A. foot B. arm C. head D. body
7.( ) A. felt B. will feel C. are feeling D. has felt
6.( ) A. air B. sun C. water D. food
5.( ) A. while B. before C. as D. after
4.( ) A. can B. may C. need D. must
3.( ) A. much B. more C. most D. slow
2.( ) A. to work and play B. working and to play
C. to work and playing D. working and playing
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