选择适当的介词填空.
on,for,of,at,from,in,with
1.I'm going to the supermarket ______ my mother.
2.Go staight ______ five minutes.Then turn right.
3.He often watches catoons ______ TV.
4.The post office is east ______ the bookstore.
5.The cloud comes ______ the vapour.
6.Go ______ a green light.
7.My birthday is ______ May.