難度：★  考點：情態(tài)動詞的用法

　　1.You________stop when the traffic light turns red.

　　A.can  B.had better  C.need  D.must

　　2.When winter comes,days get______.

　　A.long and long  B.short and short  C.longer and longer  D.shorter and shorter

　　3.-Mum,must I stay there the whole day?

　　-No,you____________.You____________come back after lunch,if you like.

　　A.mustn't;can  B.needn't;must  C.needn't;may

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