CÂU 680. WE SPENT HALF A YEAR ... THIS HOTEL. A. TO BUILD B. BUILT C....

We are all destroying the earth. The seas and the rivers are too dirty to swim in. There is so

much smoke in the air that is unhealthy to live in many of the world’s cities. In one well-known

city, for example, poisonous gases from cars pollute the air so much that traffic policemen have

to wear oxygen masks.

We have cut down so many trees that there are now vast areas of waste land all over the world.

Farmers in parts of Africa cannot grow enough food to eat. In certain countries in Asia there is

too little rice. Moreover, we do not take enough care of the countryside. Wild animals are

quickly disappearing. For instance, tigers are rare in India now because a lot of them have been

killed. Therefore, we must act now before it is too late to do anything about it. Join us now. Save

the earth.