IX. Выберите правильный вариант согласно содержанию текста

1. a) A seepage of crude oil appears as a tarlike deposit.

b) A seepage of petroleum appears as a tarlike deposit.

c) A seepage of gas appears as a tarlike deposit.

2. a) The well had to be free of liquids during the drilling mud.

b) The well had to be free of liquids during the drilling process.

c) The well had to be full of liquids during the drilling process.

3. a) A cement slurry is forced between the outside of the casing and the inside surface of the drill hole.

b) A cement slurry is forced between the inside of the casing and the inside surface of the drill hole.

c) A cement slurry is forced above the outside of the casing and outside surface of the drill hole.