We are all slowly (26) __________ the earth. The seas and rivers are too dirty to swim in. There is so much smoke in the air that it is unhealthy to live in many of the world’s cities. In one well-known city, for example, poisonous gases (27) __________ cars pollute the air so much that traffic policemen have to wear oxygen masks. We have cut down (28) __________ trees that there are now vast areas of wasteland all over the world. As a result, farmers in parts of Africa cannot grow enough (29) __________. In certain countries in Asia, there is too little rice. Moreover, we do not take care of the countryside. Wild animals are quickly disappearing. For instance, tigers are rare in India now because we have killed too many of them. However, it isn’t enough simply to talk about the problem. We must act now before it is too late to do (30) __________ about it. Join us now. Save the Earth! 26. A. destroyed B. destroying C. destroys D. destroy 27. A. by B. from C. of D. in 28. so much B. so few C. so little D. so many 29. A. eating B. to eat C. for eat D. to be eaten 30. A. anything B. nothing C. everything D. something. Xin cấu trúc từng câu ạ/...