Question

10. Вместо пропусков вставьте необходимые по смыслу модальные глаголы «can», «must», «should».
1. Сhemicals ___ be used carefully in the laboratory.
2. You ___ stay out of the laboratory if your teacher is not there.
3. Many of the chemicals ___ be dangerous.
4. All chemicals ___ be treated with care.
5. How ___ you tell that a substance is pure?
6. Dalton`s ideas about atom ___ explain many scientific laws.
7. A substance ___ be recognized by its properties.
8. A question that we ___ answer is how the atoms get electrical charge.

Answer 1

1. Сhemicals must be used carefully in the laboratory.
2. You should stay out of the laboratory if your teacher is not there.
3. Many of the chemicals can be dangerous.
4. All chemicals must be treated with care.
5. How should you tell that a substance is pure?
6. Dalton`s ideas about atom can explain many scientific laws.
7. A substance must be recognised by its properties.
8. A question that we must answer is how the atoms get electrical charge.