Кусок сплава из свинца и олова массой 664 г имеет плотность 8,3 г/см3. Определите массу свинца в сплаве. (Принять объем сплава равным сумме объемов его составных частей.)

1. Complete the text. Use can, can’t, could, be able to, must, will have to or have to.

1. I’m afraid I (1) …………….help you at the moment.

2. I don’t think I’ll (2)…………….. come to the meeting.

3. The negotiations broke down because we (3)……………agree on the price.

4. I (4)…………….. remember to email Steve and thank him for all his help.

5. Sorry, I (5)……………….go now, the meeting begins in five minutes.

6. You (6)………………….try to be more diplomatic when you are speaking to Tim.

7. I find Portuguese very difficult. I (7)……………..understand it, but I (8)……………. Speak it.

8. - Will you (9)………………… go to the training seminar?

   - No, I (10)……………….. . I’m very busy.

9. I’m sorry. I (11)…………….. come to your talk yesterday. I had to sort out a problem.

10. I (12)………………. go to the dentist next Friday morning, so I’ll be a little later.