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（友情提示：鼠标拖选单词即时翻译）
( ) 21.--- Look, you have missed _____ “s” in the word “glasses” .
---Sorry, I’ll correct it right now.
A. a B. an C. / D. the
( ) 22. --- _______ can you achieve your dream?
---I can achieve my dream _______ working hard at school as much as I can.
A. How, with B. What, with C. How, by D. What , by
( ) 23. --- If I _______ a million dollars, I ________ set up a library for our school.
---That’s a good idea.
A. were , would B. had , would
C. has , will D. have , would