题目内容

选择下列单词的正确形式填空,每个只能用一次。

if

when

before

must

because

may

after

mustn't

can't

until

(1) Please give me a ring _________ you talk to your parents.

(2) You must wait ________ others get on the bus.

(3 )Don't say that _________ you look at the picture.

(4) _________ the lights are red, you must wait.

(5) Excuse me. ________I use your car, please?

(6) Tom was away yesterday _________ he was ill.

(7) I ________finish my homework first.

(8) You ________ play in the street. It's too dangerous.

(9) ________ you make lots of noise, you may disturb others.

(10) They ________ solve the problem. Let's help them.

答案:after;until;before;when;may;because;must;mustn't;if;can't
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