A．account

　　B．reason

　　C．increase

　　D． occurrence

　　16．—Has your former classmate come back from America?

　　—Yes ，he________there for eight years.

　　A．has stayed

　　B．stays

　　C．stayed

　　D．had stayed

　　17．When all the guests have arrived，please don’t forget to show them around our school，________？

　　A．do you

　　B．don’t you

　　C．will you

　　D．won’t you

　　18．The Internet，as well as newspapers and magazines，________a more and more important part in our daily life.

　　A．have played

　　B．are playing

　　C．is playing

　　D．has been played

　　19．If you often feel tired and can’t focus your attention，that is________you have to stop working too hard and to have a rest.

　　A．why

　　B．whether

　　C．when

　　D．what

　　20．________it have been the failure to pick up directions from the ground control that caused the air crash?

　　A．Must

　　B．Could

　　C．Would

　　D．Should

　　21．The lazy boy is expecting a way________he can get through the exams without hard work.

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