初三英语疑惑

有一些英语的问题请简单说明一下为什莫选这个的原因答案我知道2.WhenIwalkedpasthisofficeat11o'clocklastnight,Isawthelightsinitstill________.A.inB.onC.atD.off5.Ican'tbelieve_____littlegirlscanwrite________manybooks.

A.so;soB.such;suchC.so;suchD.such;so

()38.Thereis_____________bridgeintheoldtown.

A.a800-metre-longB.an800-metre-long

C.a800-metres-longD.an800-metre-long

2.---MayIgoswimmingnow?---No,you______.Youmustfinishyourhomeworkfirst.

A.mustn’tB.maynotC.couldn’tD.needn’t

MustIfinishmyhomeworknow?---No,you_________.Youmayhavearestfirst.

A.mustn’tB.can’tC.maynotD.needn’t

-CanIgetyouadrink?--That’sveryniceofyou.I’vealreadygot_____.

A.itB.oneC.thatD.this

0.Theteachercamein________abookunderhisarm.

A.byB.withC.forD.carry

.Lasttimeifhe_____withus,we_____finishthetaskearlier.

A.is;willB.is;wouldC.was,willD.were;would