____I feel pity on earthquake victims in Sichuan, I can’t really do very much to help them but contribute my pocket money.
Mr. Smith, ______ in the factory for thirty years, is on the way back to his village.
—How was that? —I was chatting on line _____ the power went out.
Our teacher always speaks slowly and clearly in class _____.
—Are you satisfied with the answer? —Not at all. It couldn't have been ______.
By the time Mr Wang returned home from Beijing, his son's wedding _______.