给下列句子选择正确的答语。

⑴I'm sorry, Mom.   A. Once a month.

⑵What time is it?  B. Sorry, we can't.

⑶Why not go out to play?  C. It doesn't matter.

⑷When shall we meet?  D. It's half past nine.

⑸How often do you go shopping?  E. Let's meet at four o'clock.