Английский язык, грамматика.

1.Only very small quantities of halon are required [A — to achieve /B — achieve /C – to be achieve] this effect.

2.[A — Being calling/B — Being called / C – Being call] too late the firemen couldn't extinguish the fire.

3.[A — Vaporize/B — Vaporized/C – Vaporizing] liquids are heavier than most other liquids.

4.You can improve your English by [A — reading /B — having reading / C – have reading ] a lot.

5.Water [A — is used /B — uses /C – is using] for the majority of fires.

6.Back draft is dangerous to firemen engaged in [A — opened/ B — opening /C – opens] up a burning building.

7.Highly reactive compounds of oxygen, hydrogen and halogens [A — involved /B — involving /C – ought to be involved] in this process.

8.Fire-fighters [A — are dealing /B — dealing /C – were dealing ] with a fire a re true herous .

9.Не was [ A — appoint/ B — to appoint /C – appointed ] deputy chief of a fire brigade.

10.I know of the article [A — had /B — having been / C – have ] translated by our post - graduate students.

11.Before [A — trying /B — to try / C – have trying ] to extinguish a fire a fireman must decide which of the three factors he will remove.

12.Не thought of [A — reads /B — to read / C – reading ] this book.

13.The man [A — operated/B — to operating / C – operating] this pump is a very good specialist.

14.New types of breathing apparatus [A — created /B — to create / C – was created] at this plant are very efficient.

15.I know of his [A — had /B — having / C – have ] applied foam with great caution.