A．with which

　　B．to which

　　C．of which

　　D．for which

　　6．They met with some problems，so they demanded that some skilled workers ________ to help them.

　　A．sent

　　B．would be send

　　C．be sent

　　D．were sent

　　7．—Do you have any difficulty operating the machine?

　　—________ to speak of.

　　A．No

　　B．None

　　C．Nothing

　　D．Neither

　　8．—Do you know Professor Yu，an outstanding expert in computers?

　　—Exactly.But I ________ with him for about five years.

　　A．have been in touch

　　B．have lost touch

　　C．have been out of touch

　　D．had been out of touch

　　9．________ allow drugs to become uncontrolled in our district.

　　A．In certain circumstances can we

　　B．In no circumstances we can

　　C．Under any circumstances we can

　　D．Under no circumstances can we

　　10．________ toothache，the old man felt very bitter，having no good sleep.

　　A．Not being rid of

　　B．Not ridding of

　　C．Not rid of

　　D．Not having rid of

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