15.Hewon’tgiveupuntilhetheproblem.A.workonB.atworkC.willworkoutD.worksout15.Hewon’tgiveupuntilhetheproblem.A.workonB.atworkC.willworkoutD.worksout16.It’sagoodhabitbreakfasteveryday.A.hadB.haveC.hasD.tohav

　　15.Hewon’tgiveupuntilhetheproblem.A.workonB.atworkC.willworkoutD.worksout

　　15.Hewon’tgiveupuntilhetheproblem.

　　A.workonB.atworkC.willworkoutD.worksout

　　16.It’sagoodhabitbreakfasteveryday.

　　A.hadB.haveC.hasD.tohave

　　17.Thestudentsaretogetgoodresults.

　　A.hardworkB.hardworkingC.workhardD.workinghard

　　18.eachterm,teachersgiveoutnewbooks.

　　A.IntheendB.InthebeginningofC.atthebeginingD.atthebeginningof