—Because large quantities of water ________.

　　A．have polluted

　　B．is being polluted

　　C．has been polluted

　　D．have been polluted

　　7．The wet weather will continue tomorrow，when a cold front ________ to arrive.

　　A．is expected

　　B．is expecting

　　C．expects

　　D．will be expected

　　8．Hurry up! It’s time ________ class and it’s high time for you ________ class.

　　A．for；to go back to

　　B．of；for going to

　　C．of；to go back to

　　D．for；going to

　　9．Information has been put forward ________ Zhao Wei will play an important role in this film.

　　A．while

　　B．that

　　C．when

　　D．as

　　10．The computer was used in teaching.As a result，not only ________，but students became more interested in the lessons.

　　A．saved was teachers’ energy

　　B．was teachers’ energy saved

　　C．teachers’ energy was saved

　　D．was saved teachers’ energy

　　11．He had a wonderful childhood，________ with his mother to all corners of the world.

　　A．travel

　　B．to travel

　　C．traveled

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