We have been in No. 7 Middle School ____ three years. A. since B. in C. for
Teachers will hardly use chalk in the future, ______?
— What nice coffee! — But I think it will taste ______ with sugar.
— What’s wrong with you, sir? — My flight ______ ten minutes ago. What should I do?
It began to rain ______ I was walking in the park.
Turn the computer off, Peter! You ______ play games so late any more.