Поставьте глагол в соответствующем времени страдательного залога.
1. The boiling point (determine) after the experiment begins in half an hour.
2. The substance (dissolve) in nitric acid when the professor came in.
3. By the end of the next experiment the volume of liquid (measure) in a graduated cylinder.
4. The result of the reaction of sulphuric acid with potassium (obtain) yet.
5. Many experiments (carry out) by pharmaceutical students yesterday.
6. By the end of our practice many medicinal plants (collect) at the botanical stations.