1.(the)A number of the students (who)B gathered (at)C the gate of the school (were)D tow hundred.
2.After (washing)A ,she (hanged)B the jacket (on)C the line (in)D the courtyard.
3.Hugh (was)A busy (to clean)B his room when I(paid)C him (a)D visit.
4.(Only)A (on)B one occasion (he has)C ever (felt frightened)D.
5.(Surrounding)A (by )B the pupils,the teacher (began)C (to tell)D them a story.
6.-"(Where)A is my text book?"-"I (lay)B it (on)C the desk (a few)D minutes ago."
7.The (advertiser)A found it (difficulty)B (to make)C a speech (in public)D.
8.(Many people)A were (serious)B ill after the forest fire,so they were (taken)C to the (nearby)D hospital.
9. If the pilot (hadn't)A seen the (letters SOS)B ,the woman and her (two babies)C might not (have)D rescued.
10.A child (to bring up)A by their (grandparents)B (is)C often (spoiled)D.

1.选D，were应该为was，与主语the number单数相对应。
2.选B，应把hanged改为hung悬挂的过去时,hanged表示绞死的过去时。
3.选B，be busy doing sth.
4.选C，only放句首要部分倒置。应把he has改为has he
5.选A，surrounding应该为surrounded被包围，相当于主语teacher was surrounded by the pupils and began to tell them a story.
6.选B，应把lay放置改为它的过去时laid，因为后面有过去时间词a few minutes ago.
7.选B，应把difficulty名词困难改为difficult形容词困难的。find it + 形容词 + to do sth. 发现做某事很……
8.选B，应把serious改为seriously严重地，用来修饰形容词ill.
9.选D，have 应该为have been， might not have been rescued.没不可能获救了，表示“被救”
10.选A，应该把to bring up 改为 to be brought up 或是直接用brought up.表示“被抚养被教育长大”