Make sure you know the words and word combinations from the box and insert them into sentences. ( consists, the system of piping, explosions, volume, the boiler, tank, radiators, the water, at all times, hot water installation ) A steam, or a hot water heating plant essentially of the radiators, the boiler and connecting the former with the latter. Steam or hot water from is circulated through the piping and : in these the steam condenses giving up its latent heat and given up some of its heat, thus warming the rooms. In the usual , the boiler, pipes and radiators are kept full of water , an expansion being provided to compensate for the increase in of water when heated and to prevent in case of generation of too much steam.

I insist that you do your homework. You ___ must do your homework.

2. Will you let me speak to David, please? ___May I speak to David,

please?

3. Talking is not permitted during the test. You _can talk during the

test.

4. It isn’t possible for him to come to the party. He _may come to the

party.

5. It’s forbidden to feed the animals in the Zoo. You _can feed the

animals in the Zoo.

6. Would you mind if I read your book? May___ I read your book?

7. Perhaps they’ll come with us. They ___must come with us.

8. Would you mind if I use your glasses? May I use your glasses?

9. Perhaps, she will phone them today. She ___must phone them today.

10. Perhaps, she is asleep now. She must be asleep now.

11. I don’t want anyone to know it. You __can tell anyone.

12. Listen! I __can hear someone crying.

13. You___can___ be a member of the library before you can borrow books.

14. I see your passport, please?

15. Don’t tell anybody what I said. You __must___ keep it secret.