It's not_______ good idea to work hard for four hours without_______ break.
—What is the most important for us to learn well as students? —I think your teacher should ________ carefully in class?
—Jim, could you tell me if you _____________ our party tomorrow? —I think I will if I _____________ free.
—You __________ in the south of China, didn’t you? —Yes, but now I like living here though it’s cold all the year around.
—I can’t always understand when people talk to me in English. —Why not __________English more after class?
— You must keep the door _______ when you leave your room. — But I want to get the fresh air. I think I can keep the window ________ instead.