初二英语选择题,在线等

初二英语选择题,在线等
下面的几个问题请回答,有解题说明的会追加金币,多谢!
1. The summer holiday Mary ______ to Beijing and visit the Summer Palace.
A.flies B.flew C.fly D.would fly
2. Passengers ______ flight CA765 to London,please go to Gate3.
A.to B.onC.forD.in
3. The dress is _______ expensive. I don't want to take it.
A. a lot of B. a little ofC. a bit D.a bit of
4. He, together with his classmates ,________ to Beijing _______ they don't know the news.
A. has gone; soB.have gone;soC.has gone;and D.have gone;so
5. It is ________ bad weather ________ we decide to stay at home.
A. very; that B.so; that C.such a; that D.such; that
6. She won't go to the concert,_______________ I.
A. so will B. neither do C.nor willD.so would
请问：2题为什么不选介词for？