三、用所给动词的适当形式填空

1．It is brave of you ____________ (save) the drowning boy.

2．At the age of 17, he ____________ (set) sail for America.

3．He found jewels, gold and the ____________ (preserve) bodies of dead kings.

4．He as well as I __________ (be) to blame.

5．All my years of training ______________ (pay off).

6．Its makers spent much money ____________ (build) the ship.

7．It was 3 years since we ____________ (part).

8．The book you ____________ (refer) to the other day is well worth reading.

9．Every means ____________ (try) to solve the problem.

10．It was the second time that she ____________ (see) her grandfather.