【2014重庆】There ______ more and more foreigners learning Chinese now.
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.