These shirts are 100%____________ ________.

（3）空气清新而纯净。

The air was__________ __________ __________.

(4)我看见这封信纯属偶然。

I saw the letter__________by chance.

答案：（1）purify　(2)pure cotton　(3)sweet and pure　(4)purely

8.单项填空

(1)Through the window we could see__________of food was on the table.

A.quantities B.a quantity C.number D.A and B

提示：句意为:"从窗子看，我可以看到大量的食物在桌子上。"a quantity of和quantities of后接可数或不可数名词均可，a number of后接可数名词复数形式。

答案：D

(2)A large__________of beer is sold.

A.number B.quantity C.size D.volume

提示：a (large) number of后面接可数名词的复数；size是物体的形状大小；volume是容量或体积。

答案：B

（3）The__________of service has improved.

A.method B.attitude

C.quality D.quantity

提示：句意为:"服务质量大有进步。"method指做事的方法；attitude"看法"。

答案：C

(4)As a result of destroying the forest, a large__________of the desert__________covered the land.

A.number;has B.quantity;has

C.numbers;have D.quantity;have

提示：a large quantity of 修饰名词作主语，谓语动词用单数。

答案：B

9.单项填空

(1)Water__________electricity widely all over the world.

A.is used to produce B.is used to producing

C.used to produce D.used to producing

提示：句意为:"水被广泛地用于发电。"

答案：A

（2）There__________many people__________in the office, but now nobody is allowed to.

A.used to be;smoking B.used to have;smoking

C.used to be;smoke D.used to have;smoke

提示："过去曾经有"用"There used to be..."表示；"有人干某事"用"There be someone doing sth."表示。

答案：A

(3)I__________to be quite afraid to live in that country, but now I have__________to the life there.

A.used;been used B.used;used

C.was used;got used D.got used;been used