— You should be careful when ________.— Yes, I will. I’d like to know when ________ to have a rest.
Students should do everything they can __their study.
If you are a little careful, I think you can _____the problem.
Joan writes ____than she did 2 years ago.
—The pollution problem here seems to get more and more serious. --Yes. Something_____about it.
When I got to the cinema, the movie ___for 15 minutes.