当你和朋友通完电话时,你应该说“__________”。A.Hello! B. How do you do? C. Bye-bye!
There are usually ____ people in the supermarket every weekend.
Do you know how to ____ ice into water?
Let’s try our best to ____ paper to save the trees.
We tried to stop the flames from spreading, but we knew it was ____.
My parents go to work by bike ____ by bus.