3. 这本书是专为第一年学习英语的青年人用的。

The book     youngsters in their first year of learning English.

2. 苹果碰巧掉在他的头上。

The apple fell   on his head.

1. 我昨天找书的时候，偶然发现了这张照片。

I      when looking for a book yesterday.

5. Jane gladly gave up her part-time job to devote herself entirely her art.

4. They were all working hard to preparethe wedding. 

3. We want to give all children a world free violence.

2. He thanked the nurses who had caredhim while he was sick.

用适当的介词填空。

1. They are doing some research  the language of dolphins.

5. Although she's recovering from her illness,her r of progress is quite slow.

4. There were at least three g  grand-parents,parents and children — at the wedding.