Task 1.

1. attend
2. crowded
3. traffic jam
4. rush hour
5. convenient
6. suburb

Task 2.

1. free of charge
2. property
3. benefit
4. encouraged
5. coast
6. landscape
7. heritage
8. acquire
9. value

Task 3.

1. population
2. condition
3. evident
4. recycle
5. save
6. nuclear
7. poison
8. oil spills
9. shortage of water