Just as I was leaving the house，it occurred to me that I （）to take my keys.

–Excuse me，sir.I’m writing a research paper on Chinese culture.Do you mind a few questions？--（）

A.Certainly.
B.By all means.
C.Yes，please.
D.No，of course not.

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—Must I be home before seven？—（）.

A.No，you won’t
B.No，you mustn’t
C.No，you needn’t
D.Yes，you will

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