选出不同类的单词。（每小题1分，共10分）
( ) Why is he _____? A. cry B. crying C. laugh
（）Why are you ____ at the sky ? A. look B. looks C. looking
（）It’s easy to _____ mistakes with English words. A. make B. makes C. making
（）They ____ the caps on . A. put B. puts C. putting
（）What’s _____ the bag? A. into B. in C. at
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