unit 4

4. Providing water to grow plants and crops.
6. Road or place that so crowded with traffic or people as to hinder freedom of movement.
9. A time during each day when traffic is at its heaviest.
13. The people who live in a place
15. Different from what is usual or traditional.
17. The suffix -ant combines with __ to make nouns: immigrate-immigrant.
20. The suffix -ize combines with __ to make verbs: commercial-commercialize.
21. It was a small agricultural but it has been __ and is now full of factories.
23. A way of describing the size,amount,etc.of something.
24. The removal of salt from sea water.
25. Using natural energy and products that don't harm the enviroment.

1. Now city __ are busy trying to create sustainable encironments.
2. The suffix -al combines with __ to make adjectives: nation-national.
3. A good change for advancement on progress.
5. That can be replaced naturally.
7. Successful applications to become members of a course,university etc.
8. Normal and ordinary.
10. Protected from direct light.
11. Most difficult for people to bear.
12. There are about 7 million __ in London.
14. Made someone decide to do something.
16. Not possible for humans to live in.
18. Portion of the roadway has been designated for the preferential or exclusive use of bicyclists.
19. To study one particular subject.
22. Doubting that something is right