Variant 1 You could have come first and won the race if you … faster

17. – I am tired.

– … . But these reports must be typed before we leave.

A) I do too B) So am I C) So I am D) So do I

18. We … the film up to the end, if you … so much business.

A) could have watched/did not have B) couldn`t have watched/hadn`t had

C) could have watched/were not have D) could have watched/had not had

19. Everyone … very frightened if someone … a gun at him.

A) were/would point B) will be/pointed C) will be/will pointed D) would be/pointed

20. Has anyone left a letter for me?

Do you know if … a letter for me?

A) anyone left B) anyone had left C) has anyone left D) anyone has left

Earthquakes are the most lethal of all natural disasters. What causes them? Geologists explain them in terms of a theory known as plate tectonics. Continents are floating apart from each other this is referred to as the continental drift. About sixty mile below the surface of the sea, there is a semi molten bed of rock over which plates, or slabs, carry continents and sea floors at a rate of several inches a year. As the plates separate from each other, a few sea floor is formed by the molten matter that was formerly beneath. Volcanic islands and large mountain ranges are created by this type of movement. The collision of plates causes geological instability such as that in California called the San Andreas Fault, located between the Pacific and North American plates. The plates there are constantly pushing and pulling adjacent plates, thereby creating constant tremors and a potential for earthquakes in the area. Geologists would like to be able to predict earthquakes accurately. Using laser beams, seismographs, gravity-measuring devices, and radio telescopes, they are presently studying the San Andreas Fault to determine the rate of strain and the amount of ground slippage.