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1) We know our article … next month.
a) to be published
b) to have published
c) to have been publishing

2) The force acts upon an object and makes it … a certain distance.
a) to move
b) move
c) to have moved

3) Tungsten … to be the very metal to make filaments.
a) is considered
b) consider
c) considers

4) This scientist seems … experiments for a year.
a) to have carried out
b) to be carrying out
c) to have been carrying out

5) Batteries and cells … to supply light, heat and power on a large scale.
a) were unlikely
b) are unlikely
c) to be unlikely

6) We know heavy objects … faster than light ones.
a) to fall
b) to have fallen
c) to be fallen

7) The spring makes the mechanism of the clock … .
a) ro run
b) run
c) runs

8) Heat … to be an invisible weightless fluid.
a) is supposed
b) was supposed
c) supposes

9) He seems … the test right now.
a) to have been carrying out
b) to carry out
c) to be carrying out

10) Under these conditions, the output ... to increase.
a) to be likely
b) are likely
c) is likely

11) Never let a balloon … into the sky.
a) escape
b) to escape
c) to be escaped

12) The experiment is unlikely … today.
a) to have been finished
b) to be finished
c) to have been finished

13) This phenomenon is expected … in this book.
a) to have described
b) to describe
c) to be described

14) The phenomenon is supposed … in the 16th century.
a) to have discovered
b) to have been discovered
c) to discover

15) We will let the substance … under a constant pressure
a) to heat
b) to be heated
c) be heated

16) This technology is thought … last century
a) to have developed
b) to have been developed
c) to develop

17) Long ago people happened … that a weightless substance passed from a hotter body to a colder one
a) to think
b) to be thought
c) be have been thought

18) Such problems are sure … with the help of a supercomputer.
a) to have solved
b) to be solved
c) to solve

19) This scientist seems … out experiments for a year.
a) to be carried
b) to have been carried
c) to have been carrying

20)Rubber gloves don’t let the current … through to the skin.
a) to be passed
b) to pass
c) pass

21) The electricity … by rubbing objects cannot be used to light lamps, to boil water, to run electric trains and so on.
a)to have obtained
b)to be obtained
c)to obtain

22)Electrical measuring instruments are known … electromagnets.
a) to contain
b) to be contained
c) to have been contained

23)The laser is known … a device producing an intensive beam of light by amplifying radiation.
a)to have been
b)be
c) to be

24) The optical equivalent of a transistor is reported … produced.
a) to have been
b) be
c) to be

25) Additional radio transmitters let the pilot … his approach to an airport by watching his flight instruments.
a) to make
b) to have made
c) make