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　　6.Our room must ___ clean.

　　A. keep

　　B. be kept

　　C. to be kept

　　D. to keep

　　7.——I'd like to buy that coat.

　　——I'm sorry___.

　　A. it sold

　　B. it's selling

　　C. It's been sold

　　D. it had been sold

　　8.A new house ___ at the corner of the road.

　　A. is building

　　B. is being built

　　C. been built

　　D. be building

　　9.The key ___ on the table when I left.

　　A. was left

　　B. will be left

　　C. is left

　　D. has been left

　　10.Doctors ___ in every part of the world.

　　A. need

　　B. are needing

　　C. are needed

　　D. will need