摘要： We must keep the classroom clean.
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根据句意，选用方框中所给词语填空。
(1) Tom sits ________ Meimei and Wei Fang.
(2) They keep the door ________ and don't let the dog in.
(3) Tell the children not to ________ the machine.
(4) What shall I do ________ ?
(5) They usually do their homework ________ 7:00 ________9:00.
(6) Don't walk ________ the middle of the road.
(7) We must ________ our classroom clean and tidy.
(8) The teacher asks us to stand in ________.
(9) She is listening, but she can ________ nothing.
(10) We will meet at six o'clock. Everyone ________ be late.
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