It’s difficult _____ your sound because the noise is too high.
—The doctor told me not to drink too much but I find it difficult. —The doctor is right. _____ you drink, ______ you will be.
That old woman lives alone. But she refuses others’ help and does everything by ______.
—What’s the radio saying, Jack? —Oh, ______ meteorolite(陨石) attacked _______ earth and it fell down in Russia on February 15, 2013.
—Shall we call for a taxi? —OK. Let me _______ the phone number in Zheng Zhou Yellow Pages.
—Listen! Someone is knocking at the door. Who _____it be? —It_____ be Tom. He phoned to visit me this evening.