More often, the air in Hangzhou is dirty because of _____.
―What are you doing, Jack?―I’m looking for some information about famous people______can help me make a poster. .
—What do you think people can do for their aged parents?—They_________ do anything except to be with them and be themselves.
—Peter is not himself these days. —well, could you tell me________?
One of the difficulties we have English is how to remember new words and expressions.
—I miss my mother very much. She has gone abroad on business for nearly a year but luckily she will be back in a week. —Pardon? I ______ something else just now. ________ will she come back?