If it ________ tomorrow, we will go to the zoo. A. isn’t rain B. doesn’t rain C. won’t rain
We don’t know how to prevent the flu. Shall we ask Doctor Wang Hai for______?
—Humans can’t live _______ air. —I agree with you.
—Who taught _______ Japanese? —I learned it by _______.
—You’d better not read _______. It’s bad for your eyes. —You’re right. I won’t do that again.
_______ necessary for us _______ English well.