He used to to school by bike but he is used to to school now.A.go; walking B.go; walk C.going; walk
Shanghai is one of _______ in the world .
There are _______ students in this school.
How long have you _______ the bike?
Once upon a time, an old man tried _______ the mountains.
---- Mum, may I go out and play basketball ? ---- Well, if you _______ your homework, you can.