I must return the book to the library. I _____ it for one week.
—What _______ the number of the students in your school?—About two thousand. A number of them _______ from the countryside.
—I can hardly believe my eyes. Is that you, Lucy?—Yes. It has been almost 20 years ______ we were together.
—It’s smoggy these days. That’s terrible!—Yes, I hope to plant trees. ______ trees, ______air pollution.
—Do you like seeing a movie on your mobile phone?— No. I ______do that because it makes me uncomfortable.
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