Learn some useful skills, or, I’m afraid, you would ______ nothing in society.
What is the best way you can imagine ______the overuse of water in our school?
We should do what we have to do ______ we can do what we want to do in the future.
Please don’t phone him between 1 and 3 p.m. tomorrow. He _____ a lecture then.
If you are not satisfied with the price _______, we can still discuss it.
Drunk driving used to occur _______, but now it is under control.