you smile at others,they will smile back.
A. Before B. When C. Until D. Though
--- Look! What’s on the ground?
--- Oh, it’s my sweater. Please .
A. pick it up B. put it on
C. give it out D. take it off
It’s every policeman’s dream to keep people and the traffic in good order.
A. safe B. healthy C. busy D. famous
We have done much to protect the environment. So the river is getting than before.
A. dirtier B. dirty C. cleaner D. clean
Many city people their bikes to work every day.
A. ride B. will ride C. rode D. have ridden
Before you go to Canada, you need to learn more it.
A. form B. in C. by D. about
