补全对话。从方框中选出适当的句子补全对话。

A: Lucy, why are you going out   1 ?

B: That’s the sound of a truck collecting rubbish.

A: Do you mean you have to take the rubbish to the truck?

B: Yes. You know   2  is our duty. We should help protect the environment.

A: I agree.  3 , we must do something around the neighbourhood.

B: Sure. It is our duty to keep the environment clean and tidy. If we make a contribution to protecting the environment,  4 

A: That’s right. We mush try our best to make our country more beautiful. So we should   5  to improve the environment.

1.It’s ________ (polite) to ask a woman’s name in western countries.

2. Lily’s family is very poor, we must do something_______ (help) her.

3.LiTao studies very hard because he knows the _______ (important) of study.

4.The baby is too young , she is _______(able) to dress  herself.

5.‘May I come in , Miss Zhao?’ He asked_________(gentle)

6.------- Why didn’t Jim come yesterday?

-------Because his car______(break) down because of the heavy rain.

7. When my mother arrived home my father and I ________(plan) the trip to Sunny Park..

8.The film was so__________(bore) that all of them didn’t want to see it.

9.I found Jack_________(interest)when he tell funny stories.

10.There are twenty girls in the swimming club,________(包括) 2 American girls.

11.You’d better not believe what he says because he is__________(不诚实).

12.What a__________(可怕的) snowstorm! It killed many people.

13.It’s fine today, there is no_________(云彩)in the sky.

14.The ___________(树叶)turn brown and yellow in the autumn.

根据短文内容，从短文后的选项中选出适当的选项补全短文。

     The earth is about 4,600 million years old. We humans have lived on the earth for only 35,000 years, but during this period we have changed our planet a lot in many ways.    1  

     All over the world, people have cut down millions of trees, so more and more kinds of animals and plants are disappearing. In big cities, cars and buses have polluted the air. Factories have also polluted the land and the water.

         2   It is important to the earth. But now air pollution is destroying it and that has made a very big hole in the ozone layer (臭氧层).   3  This is very dangerous because it can cause cancer.

     Carbon dioxide (CO₂) in the air has increased a lot.   4  it has formed a "blanket" (毛毯) around the each.    5   This makes our earth become warmer and warmer. Therefore, this causes the level of the ocean to rise.

     All these problems are very serious. We must do something to stop our earth from being polluted anymore.

Napoga Gurigo，a 12-year-old girl，lives in a village in Ghana. It is   1  for her family to get clean drinking water. The nearest place to get water is a muddy （混浊的） water hole half a kilometer away from her   2 . Animals and villagers use it alike. Each morning, Napoga leaves home at half past five to collect water for her family. Sometimes it   3  a few hours to get enough water. Napoga has no time to go to school for learning. In the neighboring areas, many boys and girls   4  Napoga. They can't keep strong and   5  just because they have not enough drinking water.
In fact, 70% of Earth's surface is water. But most of   6  is sea water. We can't use salty water in our daily life. Fresh water is what we __7__ drink, take showers and cook food. And fresh water covers only 1 percent of Earth's surface. In some areas people try to make deep wells （水井） to get water from   8 . But there still   9  enough for farming. Scientists say that 10  30 years, more people in the world will face all kinds of water problems than now. So we must do something to take care of our water resources (资源).