几道初中英语题,解答请简单的说明下理由

题目

几道初中英语题,解答请简单的说明下理由
1.The light is on in his home. He( )back
A.will be B. must be C. won't be
2.Must I copy all the words now? -- NO,you( )
A.can't have to B. mustn't C. needn't
3.---Mary studies very hard
---( )
A. so do you B. so you do C. you do so
4. In this age,information( )from all corners of the earth.
A.coming B.have come C.comes

答案

1）B
他房间的灯亮着,他一定已经回来了.
2）C
我必须抄下所有的词语?
不,不需要
3）A
玛丽学习非常努力.
你也是.
4）C
这个时代,信息开自于全球各个角落.