4.虽然电脑被打开了，显示屏上什么都没有显示出来。

　 ____________________________________________________________

3.这个孩子是被绑架还是被杀了，警方还无法确定．

　 ____________________________________________________________

2.我宁愿发电子邮件给你，也不愿写信给你。

　 ____________________________________________________________

1.你给我提了这么多宝贵的建议真是太好了。

　 ____________________________________________________________

10.He lives on the _________ (十二)floor. You'd better go up by lift．

9.It’s meaningful for students to do some _________ (志愿)work．

8.Tne _____ (报告)show something of home computers used by a group of young people．

7.What is your _________ (到达)time?

6.They consider Audrey Hepburn one of the best _________ (演员)．

5.Do you have any difficulty _________ (解决)the problem?