21. You should ________ your attention ________ your work. 你应该把注意力放到工作上。

4. I can___________(预言) something with great accuracy.我能很准确地预测某事。

3. The tree cast its ________(影子) on the wall.树影映在墙上。 4. The dog is his master's ___________(影子).这条狗和主人形影不离。

(22)1. The economists __________(预言) an increase in the rate of inflation.经济学家预言通货膨胀率将会增长。 2. The fortune-teller ___________(预言) that I would marry a doctor.算命先生预言我会同一位医生结婚。 3. It is virtually impossible to___________(预言) the future accurately.精确预言未来的事实际上是办不到的.

3.Dark clouds are a ________(迹象) of rain or snow.乌云是雨或雪将至的预兆。 4. She ________(签字) her name to the document.她在文件上签了名。 5. The football team has ________(签约) two new players.该足球队已签约聘用了两名新队员。

(21)1. He walked along in the________(暗处) hoping no one would recognize him.他走在暗处，希望没有人认出他来。 2. He felt he was being ________(跟踪), but he couldn't see anyone behind him.他感觉到有人在跟踪他，但他看不见身后的人。

2. He only bought the yacht as a status ________(象征) -----he hates sailing.他买游艇只是为了显示身分--其实他根本不喜欢玩游艇.

3. He ______________(提交) a motion to the Congress.他向国会提交了一份议案。

(20)1.The dove is the ________(象征) of peace.鸽子是和平的象征。

2. The company is ______________(引进) a new family saloon this year.公司准备今年推出一种新型家庭轿车。

5.I was _________(信服的) that he knew the truth.我确信他知道事实。

(19)1. She ______________(介绍) me to her friend.她把我介绍给她的朋友。

4.I am _________(信服的) of his honesty.我对他的诚实深信不疑。

5. __________ / _________无价值的 ;　 __________ / _________无价的，价值昂贵的

(18)1. He_________(使人相信) me of his sincerity.他使我确信他的真诚。 2. Your argument is too weak to _________(使人相信) me.你的论点太薄弱了，说服不了我。 3. We utterly failed to _________(使人相信) them.我们根本说服不了他们。