we ___ be friendly to our classmates.A.may B.should C.needn'

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we ___ be friendly to our classmates.A.may B.should C.needn't D.mustn't
we _____ follow others .we should do all by ourselves A.don't need B.haven't to C.needn't D.mustn't
how easy it is ____ after a dog A.looking B.look C.to look D.looks
选什么?为什么?
第2题的D是needn't to

1 B 应该
分析：A 可能； C 不必； D 不能
2 D 表示禁止（分析：A中的NEED 是实义动词,后要接TO DO ； B HAVE TO 的否定式是DON‘T HAVE TO； C不必,与句意不符）
3 C
it 's +adj.+ to do sth 固定用法
加油!不明白再问!
再问：第二题选C。做作业时我选错了，老师要求订正，但我不知道如何订正
再答：我认为不可能是C 根据后半句句意：我们应该自己做完。（意思就是我们不能仿效别人的）
再问：题目写错了D是needn't to .
再答：这样说答案就是C了因为D中的NEED 是情态动词，后要接动词原形

we ___ be friendly to our classmates.A.may B.should C.needn' We can't f_____with our classmates.We should be friendly We ______laugh at our classmates.A.must B.may not C.mustn't We should be friendly to ------.(other ) May I come in? No, you ___. A. mustn't B. needn't C. may not They( )be polite to their parents.A should B may C maybe D c We should be strict-----in study.A.myself B.our own C.oursel We should be strict-----in study. A.myself B.our own C.ourse May I come in?No,you ___.A.mustn't B.needn't C.may not D.are ______that as it may ,we have nothing to lose.A.Be B.If C.We You should make your clothes ___ A.be clean B.to be clean C 用所给词的适当形式填空 We should get on ___(good) with our classmates a