Before_____ white, the door should be cleaned thoroughly.
A. painting B. painted C. being painted D. having been painted
--- Did you seea man in black pass by just now?
--- No, sir. I ________ a newspaper.
A. read B. was reading C. would read D. am reading
My parents live in a small village. They always keep candles in the house ____ there is a power cut.
A. if B. unless C. in case D. so that
--- An ant has two stomachs --- one for itself, one for others.
--- Really? Quite interesting. I ____ anything about it.
A. don’t know B. have known C. haven’t known D. didn’t know
I’m sorry, sir, I _____ the work last Monday, but I was too busy.
A. ought to B. should finish C. must have finished D. was to have finished
Water can absorb and give off a lot of heat without big changes in temperature, thus creating a _________ environment.
A. peaceful B. sensitive C. common D. stable
