Units5-8自测题

I.单项选择1.Look!There is no light on,they_____be athome.A.can’t B.mustn’t C.shouldn’t2.Please remind me_____he said he was going.Imaybe in time toreach the station tosee himoff.A.what B.how C.when3.Listen!There must be someone______at thedoor.A.knocks B.knocking C.knocked4.He has_______homework to do and this prob-lemis______difficult towork out.A.toomuch;toomuchB.much too;much tooC.toomuch;much too5.He is the only student in our class who_____the exam.A.pass B.have passed C.has pa…