Укажите времена глаголов в следующих предложениях:
1. Such question can not be answered at once.
2. The rate of the reaction is to be influenced by gas temperature.
3. Einstein’s theory of relativity has to be referred to by many researchers.
4. All the instruments should be looked at with great interest for they are
widely used in the lab.
5. The liquid was to be allowed to evaporate.
6. This insoluble compound should not be affected by acids.
7. It must be noted that this huge automatic unit is operated by only a few
men.
8. It is to be remembered that concentrated acids are very dangerous.
9. All the devices and glassware are to be kept in good order in the laboratory.
10. Nitric acid may be obtained by the reaction of concentrated sulfuric acid
with sodium nitrate.
Заранее
