1.Theycan'tleaveuntilthey__theirwork.A.didB.aredoingC.havedoneD.hasdone2.I__heresinceImovedhere.A.willworkB.workedC.workD.havebeendoing3.__sixyearssinceIbeganstudingEnglish.AtheyhavebeenB.ItisC.ItwasD.Thereare4.-How

　　1.Theycan'tleaveuntilthey__theirwork.

　　A.did

　　B.aredoing

　　C.havedone

　　D.hasdone

　　2.I__heresinceImovedhere.

　　A.willwork

　　B.worked

　　C.work

　　D.havebeendoing

　　3.__sixyearssinceIbeganstudingEnglish.

　　Atheyhavebeen

　　B.Itis

　　C.Itwas

　　D.Thereare

　　4.-Howlonghaven'tweseeneachother?

　　-Well,it__nearlytwoyearssincewe__last.

　　A.is/havemet

　　B.was/hadmet

　　C.is/met

　　D.hasbeen/hadmet

　　5.Don'tgetoffthebusuntilit__.

　　A.stop

　　B.willstop

　　C.stopped

　　D.hasstopped

　　6.Whenhe__allthenewspapers,hewillgohome.

　　A.sells

　　B.hassold

　　C.willhavesold

　　D.willbesold