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__ their own interest. A. be based on B. base on C. be basing on D. base at 9. Strangers ________ to him in the street and said how much they enjoyed his book. A. ran away B. dropped off C. came up D. turned down 10. If better use is ________ your spare time, you’ll make good progress in doing your business. A. spent B. made of C. used for D. taken 11. The engineers are so busy that they have zero time for outdoor sports activities,________ they have the interest. A. wherever B. whenever C. even if D. as if 12. The government has a lot of problems to deal with, ________ air pollution and the increasing price of housing. A. such as B. for example C. namely D. that is 13. — Hello! Is in the office? — I’m is busy __ ______ and can’t speak to you. A. at once B. at present C. at the end D. at first 14. The number of foreign students attending Chinese universities ____ rising steadily since 1997. A. is B. are C. has been D. have been 15. In the good care of the nurses, the boy is ________ recovering from his heart operation. A. quietly B. actuall