课时作业(十七)　[必修4　Unit 2 Working the land] (限时：35分钟)Ⅰ.单项填空________as much as possible is necessary.

　　A．Having read

　　B．Read

　　C．Reading

　　D．To have read

　　2．—I regret________you that John has been fired.

　　—I can hardly believe my ears.He is such a fine worker.

　　A．telling

　　B．having told3．—The cars give off a great deal of waste gas in the streets.

　　—Yes.But I'm sure something will be done to________air pollution.

　　A．reduce

　　B．remove

　　C．drop

　　D．warn

　　4．Having been praised by the teacher，the little girl ran back home，________sfied

　　D．anxiously and excitedly

　　5．The diamond mine ________ accidentally by a little boy when he was playing hide­and­seek.

　　A．discovered

　　B．was discovered

　　C．has been discovered

　　D．would discover

　　6．In Bangkok severe flooding, many major roads ________ north, towards the areas worst affected by the flooding, were largely impassable.

　　A．to lead

　　B．leading

　　C．led

　　D．to be led

　　7．It is reported that the newly­built studio is ________badly.

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