4.Add -er or -ion to or remove them from the following words to form new words.

words learned        New words formed

-er

browse v.浏览                     browser n.浏览器

message v.给...发消息 给...留言      messenger  n.送信人， 邮递员

       N.信息，消息             

consumer  n.消费者               consume v.消费，消耗

-ion

object v.反对                      objection n.反对

react v.反应，做出反应，反抗       reaction n.反应

constitute v.组成，构成             constitution n.建立，组成，构造，宪法

cultivate v.耕作，种植，教养，栽培   cultivation n.教养，栽培，耕作

define v.下定义，规定               definition n.解释，定义

expand v.扩展，扩大                expansion n.扩展，扩大

concentration n.专心，集中          concentrate v.集中，专心于

civilization n.文明，文化，开化       concentrate v.集中，专心于

1 Public opinion was becoming more_concentrated_ on environmental pollution problems; more and more people were discussing and arguing about them.

2.Martin Luther King is a(n)_messenger  who worked for peace; he has shown the Western world that a struggle can be waged without violence.

3 Every man ought not to steal, cheat, or destroy the property of others. There is no place for this sort of behavior in a(n)__ civilized_society.

4 The right to pursue happiness is promised to Americans by the US__Constitution

, but nowadays no one seems quite sure what exactly is meant by happiness.

5 You will need to replace your old_____ browser and install a new one. You will need this new software to view web pages.

6 Rock music appealed to Sandy so much that she turned up the volume on her player, paying no attention to her father's objection.

7 As a college student, you should learn things extensively and aim for a(n)expansion of knowledge well beyond your area of specialization.

8 Because women care much about their appearance and restrict their diet in an effort to control weight, they may not  consume  enough iron-rich food.

9 The problem is that most students don't really know the exact definition of plagiarism (剽窃) or its consequences, so they don't consider it a serious crime.

10 Garden cultivation of roses began about 5000 years ago. They were used at celebrations, for medical purposes, and as a source of perfume.

11 The talks next week will focus on economic development of the region and our immediate reaction to the ever-worsening condition of the environment.

12 The negotiation on the trade disputes between the two super large companies went on for years as neither side would give in.