1.A big crowd gathered ____ him ____.

1.A big crowd gathered ____ him ____.
A.to hear; speak B.hearing;speaking
C.to hear;speaking D.hearing;to speak
2.He gave me the phone number in order ____ contact him when we are in need of help.
A.to B.of me to C.for me to D.that i
me 和 for me 的区别~
3.___ arriving home,i changed my mind.
A.at B.as C.on D.about
为什么不用as?
4.The cleaning is ____ by midday.
A.to finish B.to be finished C.finishing D.being finished
这里能用 finished吗?和B又有什么区别?