4.Could you tell me what you have been doing l_______? 5.It’s important to find e_______ to support your judgement .

3.Professor Wang has been doing r_______ on Yetis for about 20 years.

2.There are many s_______ of UFOs all over the world every year.

1.One of Charles Dickens’ novels is called A T______ of Two Cities.

18. live on　　　 ②以……为主食　 They live on fish and rice.

③靠……生活　　 He lives on $80 a week.

[词汇操练]

(根据所给汉语或者首字母写出单词的正确形式，使句子完整通顺，每空一词)。

17. make one’s way (to…) ①(辛苦地)前进、行走②(通过努力)发迹、成功

　　　　　 　　 ①继续活着

16. average　　 above / below average 在一般水平以上/ 以下

　　　　　　　　　　 　 up to (the) average 达到平均

　 　　　　　　　　 　the average age / temperature 平均年龄/ 温度

15. similar　　 be ~ to； in a ~ way　

　 　　　　　　　　 　on average = on an average　 = on the average

　 　　　　　　　　 　the average of …　 ……的平均数

14.　　　　 He didn’t expect anything in return for his help.

in turn　 ①依次地、轮流地②反过来、转而

　take turns to do something/in something

13.　 　 at no time在任何时候都不 At no time have I said such a thing!

at all times 老是、总是 = always

at times 有时、偶尔 = sometimes

in time ①来得及②总有一天

in no time立即，立刻 = soon

in return (for…) 作为回报