----Boys and girls, will you please ____ the park this afternoon? ----OK.
| A．not cleaning out | B．not to clean out | C．to clean up | D．clean up |
I _____ while watching the movie 2012 last night. Unluckily, my roommate woke me up.
| A．had fallen asleep | B．have fallen asleep | C．fell asleep | D．fall asleep |
_____ that air conditioners cause so much pollution, I would never have bought one.
| A．Had I known | B．I had known | C．Were I to know | D．Did I know |
Jumping out of ____ airplane at ten thousand feet is quite ____ exciting experience.
| A．/; the | B．/; an | C．an; an | D．the; the |
–Why didn’t you give a hand to the boy?
-- I ______ , but he struggled to his feet before I tried to.
| A．would like to have | B．would like to |
| C．would rather to have | D．would better |
The moment _____ John will never forget is ______ Mr. Smith gave him a lot of valuable advice on how to improve his writing.
| A．that; that | B．that; when | C．when; that | D．when; when |