We must keep the classroom ___________.

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.