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（友情提示：鼠标拖选单词即时翻译）
21. I don’t think you should ______; you should eat more instead.
A. put on weight B. lose weight
C. lose weighty D. put weight
22. You’d better ______ green fruit that’s not ______.
A. eat; ripe B. not eat; green
C. not eat; ripe D. to eat; green
23. The doctor suggested that we ______ too much fat and sugar.
A. don’t eat B. might not eat
C. not eat D. should not to eat