PART1: Write the correct frorm of the verbs or the words in brackets.

1. The air in the countryside is (fresh).........than the air in the city.

2.The city of Delhi in India is the (polluted)...........city in the world.

3. The air (pollute).........causes breathing problems.

4. The Red river is (long).........than the Mekong river.

PART2. Find and correct the mistakes:

1. Your city has narrow streets and older buildings than ours.

2. You must taking off your shoes before entering this room.

Question 4. Give the correct form of the words given to complete the sentences:

1. The air in the city is very _____. (pollute)

2. We'll make thic beach clean and _____ again. (beaty)

3. If the pollution _____, what will happend. (continue)

4. The world's population is growing ____ .(quick)

5. if it doesn't rain soon, there'll be a great time _____ of water. (short)

6. In most big cities, there are many wealthy, but _____ is still a problem. (poor)

7. life must be ____ in the slums. (diffculty)

VIII: Give the correct forms of the words in the brackets.

1.    Many people are very concerned about the (destroy).......................of the rainforests.

2.    The air in the city is heavily (pollute).......................with traffic fumes.

3.    The local residents promise to keep the environment (clean).......................

4.    Our teacher is pleased that we solved the problems (effect)...........................