III. Перепишите следующие предложения, подчеркните в каждом из них модальный глагол или эквиваленты. Переведите предложения на русский язык. 1. These new materials had to withstand much higher temperature than metals.
2. Laser light can be used to transmit power of various types.
3. This equipment should be tested in various conditions.
4. The consequences of the pollution of the atmosphere by different products are to be carefully studied.