1 My dad start work at eight o'clock.
a has to
b have to c should
21 - remember to finish my homework.
a doesn't have to b must
c shouldn't
31 get up at six o'clock on Mondays.
I hate Mondays!
a mustn't b have to chas to
4 You be late. It's rude.
a don't have to b must c shouldn't
5 We leave now. We can leave later.
a mustn't b should c don't have to
6 You - copy my homework! It isn't fair!
a mustn't b don't have to c should
7 Marc do the washing-up. He's already
done it three times this week.
a doesn't have to b mustn't chas to
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1. The degree of concentration has been increased  in this country recently.

2. Prices of electricity have already been raised  twice this year.

3. New wind and water energy sources have been developed .

4. Applied fields of economics have been taught to students of different universities.

5. A high living standard hasn’t been reached in most developing countries yet.

6. How the degree of competition has been influenced by the increase in the number of firms in the industry?

7. No changes have been made to distinguish the new product from identical products.

8. How much money has been given by the World Bank to the developing countries?

9. Good education has been provided for most part of population.

Объяснение:

ответ:1. The degree of concentration has been increased  in this country recently.

2. Prices of electricity have already been raised  twice this year.

3. New wind and water energy sources have been developed .

4. Applied fields of economics have been taught to students of different universities.

5. A high living standard hasn’t been reached in most developing countries yet.

6. How the degree of competition has been influenced by the increase in the number of firms in the industry?

7. No changes have been made to distinguish the new product from identical products.

8. How much money has been given by the World Bank to the developing countries?

9. Good education has been provided for most part of population.

Объяснение: