II. Прочитайте предложения, перепишите их, выделив указательные местоимения. Переведите письменно предложения на русский язык

Example: We know that a computer is a complex electronic device. – Мы знаем, что вычислительная машина является сложным электронным устройством.

1. That machine is quite automatic – it does everything by itself.

2. There are computers that can do many jobs.

3. Two of these elements, germanium and silicon, are especially important.

4. The story of the telephone is similar to that of the telegraph.

III. Прочитайте предложения, перепишите их, обращая внимание на выделенное местоимение it, переведите предложения на русский язык.

Example: We find it necessary to repeat the experiment. (формальное дополнение) – Мы считаем необходимым повторить этот эксперимент.

1. It was in 1869 that Mendeleyev published his Periodic Table.

2. Automation makes it possible to obtain and develop new sources of energy.

3. This is a complex problem, but we can solve it.

4. It is evident that electricity will be the energy of the future.

5. It is our future specialty, but we do not know much about it at present.

IV. Прочитайте предложения, перепишите их, обращая внимание на выделенные слова ones, one, переведите предложения на русский язык.

Example: One should be very careful. – Нужно быть очень осторожным.

1. One must know that these rays produce a harmful effect on man.

2. One may work in this laboratory only observing certain rules.

3. The new technologies that are being developed must be connected with traditional ones.

4. One of the wonderful applications of electronics is radar.

V. Перепишите предложения, употребив глаголы в правильной видовременной форме, переведите предложения на русский язык. Обратите внимание на функции глаголов to have, to do, to be в предложениях.

Example: This material (to have) many valuable qualities. – This material has many valuable qualities. – Этот материал имеет много ценных свойств.

1. A good conductor (to have) many free electrons.

2. The duration of the pulse (to have) to be approximately a thousand-millionth of a second.

3. The Internet (to be)composed of a large number of smaller interconnected networks called internets.

4. They (to be) to prepare everything for the experiment.

5.Scientists (to do) a lot of research recently.

6. (to do) semiconductors conduct electric current worse than metals?