Перепишите предложения. Подчеркните инфинитив и определите его функцию. Переведите предложения на русский язык:

Вариант 1

1. To dissolve this substance is difficult.

2. To launch rockets a new type of fuel was needed.

3. The purpose of tension test is to determine the mechanical characteristics of a material.

4. The northernmost Russian health-resort is to be founded soon in Siberia, on the banks of the river Lena.

5. When airplanes appeared, Amundsen learned to fly, becoming the first Norwegian civilian flier.

6. The design of a mechanism depends on the work to be done.

7. To use atomic energy for peaceful purposes is the task of our scientists.

8. The substance to be tested must be wet or in a solution.

Вариант 2

1. To know the quantity of energy present in a body is very important.

2. To escape the pull of the sun a velocity of 16.6 kilometers per second is required.

3. In all the methods of arc welding, an electric arc is struck between  an  electrode  and  the parts  to be  welded.

4. The atom is a mighty force that is to be of great assistance to man.

5. The purpose of neutron diffusion theory is to determine the behavior of neutrons produced by nuclear fissions.

6. The dog Laika was the first living creature to fly aloft in an artificial earth satellite.

7. One must know beforehand whether sufficient current will flow through the circuit to perform the work to be done.

8. Watching one of our cosmonauts on television, we could see a growth of beard appearing on his face, so fine was the quality of the image received on the Earth.

Вариант 3

1. Galileo was the first to observe sun spots with his Optic Tube in 1609.

2. To translate ancient manuscripts was a very difficult task.

3. He was glad to have fulfilled his work ahead of time.

4. The problems to be discussed at the conference are connected with future cosmic flights.

5. Only 30 grammes of fuel are needed to keep the atomic station going for 24 hours.

6. The cultural exchange programme for the year is expected to be more extensive.

7. During the summer vacation arrangements are made by the Friendship University for the students to visit different parts of the Soviet Union.

8. The construction of a new bridge was reported to have been completed.

Вариант 4

1. The piece to be machined is held on the work table which may be adjusted to any convenient height for the job.

2. He was told those cars roll off the assembly line at the rate of one every three minutes, and next day he saw it work.

3. Drill presses are built in a variety of types, but the ordinary upright drill press is to be found in nearly every machine shop.

4. When the valve is tilted only slightly from the horizontal the throttle is said to be closed.

5. Where great stresses are to be applied, the worm is cut from a hyperboloid in order to allow for greater surface contact.

6. It is evident that the weight moves with increasing velocity and careful measurements show the rate of increase to be constant.

7. When new alloys prove to be difficult to machine, a normal tendency is to reduce the feed or speed.

8. A group of journalists and photographers was waiting for the icebreaker to arrive.

Вариант 5

1. То be effective the roughing job must be accurate and must remove as much excess stock as possible in one cut.

2. To detect and measure the irregularities of the finer surfaces requires the use of high magnification with very light operating forces.

3. The object of the piston ring is to hold the compressed and exploded gases above the piston.

4. The purpose of a compression ring is to prevent gas leakage.

5. Careful measurements show the increases to be equal between each consecutive pair of flashes.

6. There is a cam for each valve to be operated.

7. To overcome vibration in the engine, the crankshaft and flywheel are balanced separately.

8. If the bond wears away too rapidly, the wheel appears to be soft.