3、t4o’clock?---Ohno,you_____comeatfour.A.needn’tB.mustn’tC.couldn’tD.can’t7.Researchfindingsshowwespendabouttwohoursdreamingeverynight,nomatterwhatwe____duringtheday.A.shouldhavedone B.wouldhavedone C.mayhavedone D. musthavedone 8.Itwasverykindofyoutodothewashing-up,butyou_____ it.