21. — I'm going to San Francisco for a couple of days.
— ___ . I wish I could get away for a while.
A. forget it B. I really envy you C. I can't agree more D. It doesn't matter
22.— Alvin, are you coming with us?
— I'd love to, but something unexpected_ ________.
A. was coming up B,. had come up C. would come up D. has come up
