5. Прочитайте следующие предложения. Найдите в каждом из них группу «подлежащие – сказуемое», определите время и залог. Составьте все типы вопросов к предложениям.

1. Petroleum is recovered mostly through oil drilling.

2. An oil well produces predominantly crude oil.

3. Some of the gas will come out of solution and be recovered (or burned) as associated gas or solution gas.

4. The hydrocarbons in crude oil are mostly alkanes, cycloalkanes and various aromatic hydrocarbons.

5. Crude oil may also be found in semi-solid form mixed with sand and water.

6. Oil has become the world's most important source of energy.