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. ---Mum, what are you getting me for my birthday?
---_________---you’ll have to wait and see.
A. I think so B. I’ll tell you what
C. I wouldn’t say no D. I’m not telling you
22. ---What’s the matter, Mary? You are awfully quiet and look blue.
---Oh, I ________ of my best friend who went to America last year.
A. just thought B. was just thinking
C. had just thought D. have just thought
