21. ----I’m sorry, I__________ at you the other day.

----Forget it. I was a bit of control myself

A.     shouldn’t shout          B. shouldn’t have shouted

C. mustn’t shout            D. mustn’t have shouted

22. Bill wasn’t happy about the delay of the report by Jason, and ________.

A.I was neither   B. neither was I   C. I was either   D. either was I

23. --I believe you could have asked my brother for help, for he is very good at math.

---Really? Oh, a whole night __ ___.Why not tell me earlier?

A. is wasted    B. had wasted    C. was wasted    D. will waste