从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. — Sorry for what I have said to you.
— ______.
A. Don’t mention it B. You are nice
C. Forget it D. You’d better not
22. You’ll have plenty of time tomorrow, so you work too late tonight.
A. don’t have to B. mustn’t C. cannot D. shouldn’t
