Употребите соответствующие формы глагола, раскрыв скобки. 1. Our students (to study) chemistry
2. My friend (to have) his practical classes on chemistry in a chemical lab.
3. Our group (to obtain) pure hydrogen in the chemical lab.
4. Our students often (to dissolve) and mix substances in the lab.
5. Our group (to record) the yield of a reaction at the end of the lesson.
6. This student (to weigh) a substance on the scales.
7. We (to obtain) solutions and mixtures dissolving substances.​