(　　)9.They didn’t go home 　　　　they finished their work. A.because B.when C.until

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(　　)9.They didn’t go home 　　　　they finished their work. 
A.because      B.when         C.until         D.as
(　　)10. —It’s raining hard, so you should drive as 　　　　as possible. 
—OK, I will.
A.careful          B.carefully       C.more carefully       D.most carefully
(　　)11.Mary decided 　　　　out for a job at an after-school reading programme last year. 
A.try          B.to try         C.trying          D.to trying
(　　)12. —Mum, may I play computer games this evening?
—No way, you 　　　　finish your homework. 
A.can          B.must         C.may          D.will

答案.9.C　10.B　11.B  12.B