【练习】用括号内所提供词的适当形式填空。

1). The naughty boy _______ (lie) to me that the hen that _______ (lie) there just now had ______ (lay) two eggs the day before.

2). In my opinion, ________ (prevent) is more important than treatment.

3). Some programs on the Internet are full of ________ (violent) and sex.

4). With the ________ (develop) of modern industry, more and more pollution is caused.

5). China is a ________ (develop) country belong to the third world.

6). There are ________ (fundament) differences between your religious beliefs and mine.

7). His ambition is to become a great ________ (physics).

Keys: 1). lied; lay; laid 2). prevention 3). violence 4). development

5). developing 6). fundamental 7). physicist

Ⅲ.重点词汇（旨在提供词汇综合运用材料）

1. system n.[c] 系统；体系；制度；方法 systematic adj 有系统的; 有条理的

[典例]

1). The solar system includes the sun and its eight planets. 太阳系包括太阳和它的八颗行星。

2). Alcohol is bad for your system. 喝酒对身体有害。

[练习] 根据句子的意思完成句子。

1). The ______ ______ (教育系统) operates very differently in the US and China.

2). He introduced us a well-designed ______ ______ (铁路系统).

Keys: 1). educational system 2). railway system

2. lay vt. (laid, laid, laying) 把放下；摆设；铺(地毯) ；产(蛋)

[典例]

1). He laid his hand on my shoulder. 他把手放在我的肩上。

2). Who should we lay the blame on? 我们该责备谁?

[重点用法] lay短语：

lay eggs 下蛋 lay sth. aside 把某物放在一边；积蓄（钱）

lay sth. down 把某物放下 lay the blame on sb.责备某人

lay the table 摆桌子 lay emphasis / stress on sth. 把重点放在某事上

[练习] 根据句子的意思在括号里填入适当的词或翻译。

1). The bird ______ its eggs in other birds' nests.

2). He is a political leader that _____ _____ _____ _____ (非常强调) individual responsibility.

3). He ______ some money ______ for rainy days.

Keys: 1). lays 2). lays great stress on 3). lays/puts; aside

3. harmful adj. 有害的；伤害的 harm n.&vt. 伤害（某人）

[典例]

Many people are aware of the harmful effects of smoking. 很多人都意识到吸烟的危害。

[重点用法]

be harmful to sb./sth. 对......有害 do harm to sb.= do sb. harm = harm sb. 对......有害；伤害......

[练习] 根据句子的意思在括号里填入适当的词或翻译。

1). Everyone knows that smoking is ______ to your health.

2). In many cases, too much care for children from parents might even do ______ to their growth.