1. The........... river is the longest river in the world. A. Red B. Mekong C. Thames D. Nile 2. Mr Hai's cows produce......... milk. A. a little B. a few C. many D. much 3. The population of the world is always .............. . A. growing B. damanging C. destroying D. doing 4. A lot of Asian animals are ............. danger. A. at B. in C. on D. of 5. We are wasting ............. much water and power. A. very B. too C. a little D. a few 6. Trash is ................ the land. the river and the oceans. A. polluting B. burning C. wasting D.producing 7. We ................ always save water and collect paper and cans. A. are B.should C. shouldnt D. do 8. In the park, you shouldnt walk ................ the grass. A. off B. at C. on D. away