Choose A, B, C or D to complete the passage.
We are all destroying the Earth. The seas and rivers are too (1)_______ to swim in. There is so much smoke in the air that it is (2)____to live in many of the world's cities. In one well-known city, for example, poisonous gases (3)_____cars (4)_____the air so much that policemen have to wear oxygen masks. We have cut (5)______so many trees that there are now vast areas of wasteland all over the world. As a result, farmers in parts of Africa can not (6)____enough to eat. In certain countries in Asia there is so little rice. Moreover, we do not take enough care of the countryside. Wild animals are (7)_____disappearing. For instance, tigers are rare in India now because we have killed too many for them to survive. However, it isn't so simple to talk (8)_______the problem. We must act now before it is (9)____late to do anything about it. Join us now! (10)______the Earth!
Trả lời câu hỏi dưới đây:
________(1)