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1. Подчеркните Participle I и Participle П.Переведите предложения на русский язык.

1.The letter posted was not delivered in time. 2.Lying the table, don’t forget to put forks and knives properly. 3.Not knowing what to do I decided to stay home. 4.Journalists taking part in the conference are admitted by a special pass. 5.They carried out the experiment using the best computer programs. 6.Who is this smiling girl?

2.Подчеркните в каждом из них модальный глагол или его эквивалент. Переведите предложения на русский язык.

1.The most fundamental law in physics states that energy can neither be created nor destroyed. 2.Amorphous semiconductors may possibly find a technical application for solar cells. 3.He must find this article: its subject is closely connected with his work. 4.The history of the silicon solar cell began in 1954. A large-scale application, however, had to wait until the advent of the space age three years later.

Укажите функции глаголов to do, to be, to have, переведите предложения на русский язык.

The transistors and diodes are widely used on monolithic integrated circuits because of the relatively small size. 2. The semiconductor may have a net positive electrostatic charge. 3. The pilots had to maintain direct radio contact between the planes. 4. A modern automatic digital computer does more than 100 mln operations in each second. 5. Tubes have to be replaced by transistors in amplifiers

4. Прочитайте тест и ответьте на вопросы.

AN ALLOY THAT DOES NOT SINK

1.A magnesium-lithium alloy has been developed at the A. Baikov Metallurgy Institute. The new alloy has 2 main advantages – it is as light as wood and doesn’t sink in water.

2.The first component of the alloy – magnesium – is lighter than aluminium and superior to it in heat capacity and in its ability to act as the main component of various structural materials. It is, in fact, 1.5 times lighter than aluminium and 4.5 times lighter than iron. It doesn’t give off sparks from friction or being struck, and is easy to work with and weld. Magnesium is also one of the most widespread metals. Its resources are dozens of times higher than those of nickel, zink and lead.

3.As for lithium, the third element on the Mendeleyev periodic table, it is the lightest of all metals. Everything new and unusual appearing today in metallurgy, chemistry and powerengineering is to a large extent connected with lithium. Lithium is paid much attention to by scientists. According to experts’ opinion, there is much more lithium in the earth’s crust, than, say, zink or tin. Another interesting fact: over the past 20 years alone, the production of lithium metal in the West has increased 100-fold.

4.The technology of obtaining magnesium-lithium alloys is very complex. An electrically-heated crucible with magnesium and lithium is hermetically sealed and all air is pumped out of it. Instead, the crucible is filled with argon, an inert gas. Melting, pouring and cooling are all done in an airless medium.

5.The new alloy will be widely used in those branches of engineering where lightweight metals are required to produce machine parts, equipment, instruments and house-hold articles.

1.What properties does the new alloy possess?

2.In what medium is the production of the new alloy performed?

3.Name the branches of industry where the new alloy can be used.