几题英语选择题...1.-May I sit here?-No,you _____.Your seat is over

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几题英语选择题...
1.-May I sit here?
-No,you _____.Your seat is over there.
A.couldn't B.needn't C.mustn't D.won't
(麻烦解释下什么时候couldn't回答,什么时候是needn't,什么时候用mustn't,什么时候用won't...老是搞不清楚...)
2.-When will you come here?
-_____ July 11.
A.On B.At C.In
(也请说下什么时候用in,什么时候用at,什么时候用on)
3.Where is my bag?I _____ it here but now I can't find it.
A.put B.have just put C.was putting
(解释下为什么)

1.A may/can 提问用couldn't/can't回答
Must 提问用needn't回答
mustn't表示不允许,can提问
won't属于客观的事实,而非主观.
2.A 具体到几号用On,具体到几点用at,年月用In
3.A put是瞬间动词,不用完成时和进行时

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