Поставьте глагол в скобках в соответствующее время группы indefinite или perfect.
1. the alkaloid of opium (to constitute) about 25% by weight.
2. the attention to natural sources of drugs (to increase) at present.
3. since ancient times man (to use) different parts of plants for medicinal purposes.
4. by the time of harvesting the amount of active constituents (to become) the highest.
5. botanists (to collect) the leaves of this plant before the maturing of fruits and seeds.
6. since the war the institute of medicinal and aromatic plants in moscow (to develop) and (to bring into use) some 60 medicinal preparations.
7. the specialists recommend a clinical use of the drug as it already (to pass) necessary laboratory investigations.
8. we studied the methods of storing new medicinal herbs after we (to carry on) their cultivation.

morkovcha    2   18.11.2019 19:19    13