We are destroying the earth. The seas and rivers are (27) ______ dirty to swim in. There is so much (28) ______ in the air that it is unhealthy to live in many of the world’s cities . In one well-known city, for example, poisonous gas from cars (29) ______ the air so much that policeman have to (30) ______ oxygen mask. We have cut down so many trees that there are now vast areas of wasteland (31) ______ the world. As a result, (32) ______ in parts of Africa can’t grow enough to eat. In certain countries in Asia there is so little rice. (33) ______, we do not take enough care of the countryside. Wild animals are (34) ______ disappearing. We must act now before it’s too late to do anything about it. 27- A. so B. too C. very D. much 28- A. water B. fume C. bubbles D. smoke 29- A. increase B. destroy C. pollute D. clear 30- A. put B. wear C. bring D. hold 31- A. all B. over C. from D. all over 32- A farmers B. gardeners C. teachers D. plumbers 33- A. though B. more over C. beside D. however 34- A. softly B. hardly C. quickly D. heavily