列地形剖面图，能正确表示等高线图EF线地势起伏状况的是（ ）
It’s 12:00 pm now. They _________ be sleeping.
—Another cup of coffee? —No, thanks. I ________ be off. My friend is waiting for me at the school gate.
Must I finish my homework first? No, you ________.
The girl is so excellent that you ________ praise her too much.
—Listen! Someone is knocking at the door. Who _____it be? —It_____ be Tom. He phoned to visit me this evening.
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