题目内容：

 

1.During the riots(骚乱), hundreds of people_________(抓住) the opportunity to steal property.

2.He was____________ (沮丧) down by the sad news.

3.They tried in_________ (徒劳的) to persuade her to go.

4.It______________ (发生) to me that I could have the book sent to me.

5.He does the__________ (雇用) and firing in our company.

6.The children have been a great___________(安慰) to me through all of this.

7.She was ________________(推荐) for the post by a colleague.

8.Watch out for sharp bends and ___________(调整) your speed accordingly.

9.I do some _________(志愿的) work at the local hospital.

10.They suddenly became__________(意识到的) of people looking at them..

11.Anyone who ____________ (目击) the attack just now should call the police.

12.Germany____________(宣布)  war on France on 1 August 1914.

13.Could you do me a __________(帮助，恩惠) and pick up Sam from school today?

14.Using computers has a________ (有益的) effect on children's learning.

15.Mr Robb ___________(辞去) his position last month.