It's fun ______ (learn) English.

用所给单词的适当形式填空。
【小题1】Do you know how ____________ (protect) the Earth.
【小题2】What can we do ___________(keep) our city clean?
【小题3】--Look at the sign. You can’t talk here.
--Sorry. We ___________(not see) it just now.
【小题4】He would like____________ (go) shopping with you.
【小题5】What __________（make）the river dirty?
【小题6】Well ________(do), children!

It’s sunny today. I can’t wait ______ to the park and fly a kite. （ ）

A．went

B．go

C．to go

—What are you doing?(   )
—I am trying to________the bike.

A．riding

B．ride

C．rides

D．rided

介词填空题。
1. You’re good _____ math.
2. She often works _____ holidays.
3. He takes people ______ different places.
4. They make cars _____ us.
5. Lily want _____ be a scientist.