Diagnostic Test

The problem of the origin of the Earth proved to be one of the most difficult problems of astronomy. Many theories … (put forward) to explain the origin of the solar system. But the problem of life on other planets is still more difficult.

Out of the 31 satellites … (exist) in our solar system the only one known to have an atmosphere is Saturn’s Titan.

Astrophysicists for many years … (attempt) to understand the nuclear reactions and other physical events occurring in the interior of stars.

The rocket constitutes one of the deadliest weapons of modern warfare, … (realize) its operational possibilities in the closing years of the Second World War.

The method of propelling incendiaries is assumed to … (discover) by the Chinese.

They are supposed to have used “the arrow of flying fire”, which, upon … (ignite), was able to fly by itself.

Instead of … (employ) the rocket the gun was used to utilize efficiently the energy of the expanding gases generated by burning black powder for propelling a missile.

The Second World War brought rockets back into the military picture for reasons that are well worth … (mention).

In 1944 the Germans began using their rocket bomb V-2 as operational weapons. The first test of these rockets in Germany was not successful, however. After … (rise) only three feet off the ground, the rocket V-2 exploded, destroying the launching facilities.

The V-2 … mainly (employ) in the bombardment of London.

… (be) some 46 feet in length it carried almost a ton of explosives, travelling at supersonic speed, it could not be heard approaching its target.

The Allies are reported to … (follow) the course of every V-2 by radar, from launching to landing, but were unable to prevent them from falling in the London area.

If you … (work) a bit harder, you might have more success.

A: Why is he wearing his uniform? He … to school - it’s Saturday today.

The police officer demanded to know whether Sykes … (be) anywhere near 34 Aylesford Street the night before.

If you … (refuse) to cooperate with the police, you would have been in big trouble.

Steward said he … (not want) any dessert as he was full.

Tommy … (operate) on right now.

We … a swimming pool put in this week.

I’ll lend him £10 as long as he …(give) it back tomorrow.

Fiona can’t … about the meeting. I reminded her this morning.

‘You went to Chile, didn’t you?’

‘No, but I … to Peru, which is right next door.’

We … just (get on) the plane when the pilot told us to get off again.

Physics succeeded in … (achieve) the complete domination of the phenomenon.