初三英语疑惑

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.When I walked past his office at 11 o'clock last night ,I saw the lights in it still ________ .A.in B.on C.at D .off 5.I can't believe _____ little girls can write ________ many books .
A.so ;so B.such ;such C.so ;such D.such ;so
( )38.There is _____________ bridge in the old town.
A.a 800-metre-long B.an 800-metre-long
C.a 800-metres-long D.an 800-metre-long
2.--- May I go swimming now?--- No,you ______.You must finish your homework first.
A.mustn’t B.may not C.couldn’t D.needn’t
Must I finish my homework now?--- No,you _________.You may have a rest first.
A.mustn’t B.can’t C.may not D.needn’t
-Can I get you a drink?--That’s very nice of you.I’ve already got _____.
A.it B.one C.that D.this
0.The teacher came in ________ a book under his arm.
A.by B.with C.for D.carry
.Last time if he _____ with us,we _____ finish the task earlier.
A.is; will B.is; would C.was,will D.were; would