题目内容：

单句填空

1.In the market, vegetables are sold by ________ kilogram. I mean, by weight.

2.We were about to set off ________ it suddenly began to rain.

3.The two ladies are ____ the same age.

4.Mr. Smith ________ a book about China last year but I don’t know whether he has finished it.

5.Time ________ (permit), we’ll go to visit the Great Wall on National Day.

6.It will certainly be of great help to Tom, if there is a good environment, enough books and ______ (equip), as well as instruction from his teachers and friends.

7.Our present technology makes ________ possible for nations to develop new resources.

8.He had no choice but ________ (wait).

9.Lincoln said, “ Give me six hours to chop down a tree, _______ I will spend the first four hours sharpening the axe(斧头).

10._______Amy didn’t know was that her kindness would set off a chain reaction.