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二、单项选择（共15小题；每小题1分，满分15分）
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21．______ a leading role in a new film, John has a chance to become famous.
A. Offer B. Offering C. Offered D.T o offer
22．I would be happier if you did more studying while you are free, but you ___________.
A. don’t B. didn’t C. wouldn’t D. weren’t
23．They have arrived at lunchtime, but their flight was delayed.
A. will B. can C. must D. should
24．He has devoted most of his time and energy _______ a cure for the disease.
A. find B. finding C. to find D. to finding
25．— How is everything going?
— It couldn’t be _______, for I lost my wallet this morning.
A. worse B. bad C. good D. better
26． by a policeman, the children crossed the street safely.
A. To lead B. Lead C. Leading D. Led
27．It’s helpful to put children in a situation ________ they can see themselves d
