—After I graduate, I'll try to get a job, you know, as engineer. —You’re practical. I’m sure you can do a good job.
—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.
—I am afraid we will miss the early bus. —Don’t worry. We have _______ time to do it.