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.