21. ---Were you disappointed when you received the book bought through the Internet?
---Well, yes, _____. The back cover was a bit torn, but it didn’t really matter.
A. sort of B. very well C. not at all D. never mind
22. ---Pity you missed the lecture on nuclear pollution.
---I ____ it, but I was busy preparing for a job interview.
A. attended B. had attended C. would attend D. would have attended
