4. The r______ which is formed by the Three Gorges Dam is more than 500 kilometres long.

3. He has ____ cancer, so there is little hope of his full recovery.

2. This is a modern hotel and can _____ 1,000 guests at least.

1. A g_____ is a deep, narrow passage with steep rocky sides.

1、[单词填空]

根据所给单词的首字母或汉语提示完成下列句子。

3. as引导定语从句时,意为"正如……那样",如:

　　 As we know, smoking is harmful to one’s health. 正如我们所知,吸烟有害健康。

2. as或which引导的非限制性定语从句,可以修饰整个主句或主句的一部分。as引导的定语从句还可以放在主句之前,而which引导的非限制性定语从句要放在句末。如:

　　 As has been announced, we shall have our final exams next month.

　　 We shall have our final exams next month, as / which has been announced.

1. 关系代词that和关系副词why不能引导非限制性定语从句。

4. 非限制性定语从句还能将整个主句作为先行词, 对其进行修饰, 这时从句中的谓语动词要用第三人称单数。如:

　　 My son failed again in the exam, which made me very angry.

　　 注意:

3. 当先行词是专有名词或由物主代词/指示代词修饰时,其后的定语从句通常是非限制性的。如:

　　 Charles Smith, who was my former teacher, retired last year.

　　 My house, which I bought last year, has got a lovely garden.

　　 This novel, which I have read three times, is very touching.