3 Choose the correct answer. 1) You __________ (must / can) use natural medicines only. 2) The water __________ (was able to / couldn't) be cold. It has been very hot these days. 3) The blood vessels of the elderly __________ (mustn't / are not able to) stand the high blood pressure.

Ответ:

1. You can (must / can) use natural medicines only.
2. The water couldn't (was able to / couldn't) be cold. It has been very hot these days.
3. The blood vessels of the elderly are not able to (mustn't / are not able to) stand the high blood pressure.

Продолжай в том же духе! Ты молодец!