同胞们,帮帮忙啊 这里有6道英语题 高手们帮帮忙

同胞们,帮帮忙啊 这里有6道英语题 高手们帮帮忙
1.I want ( )
A.apple B.two apples C.a apple
2.We are going to go to bed ( )ten.
A.at B.in C.an
3.We are ( )the supermarket
A.in B.on C.at
4.What ( )mess
A.an B./ C.a
5.She's trring ( ) bus
A,get on B.to get on C.to sit down
6.My books are falling,please pick ( )up
A.it B.them C.they
哦,对了,顺便说说为什么