________important computers are to everybody in a modern city!
Don’t worry. The children always work hard and the teachers _______ in class.
—Mr Wang’s never been to Canada , has he? —________. He went there on business last week.
—______ a week do you use your computer? —Twice.
—Can I buy a film ticket? —Oh, sorry, we ___________.
—He’s stopped from smoking , ________he? —Yes, he ________ stopped smoking.