Выберите верный вариант. Air is a mixture ... of 21 % oxygen and 78 % nitrogen. 1consisting 2having consisted 3having been consisted

Прочитайте и письменно переведите текст: Petroleum Petroleum is a complex mixture of hydrocarbons. It contains small amounts of oxygen, nitrogen, and sulphur compounds, and traces of metal salts.

Make sentences as in example. Use the correct form of the verbs. Equipment Function 1. demand valve - - - > control the flow of oxygen to the diver (for) 2. cylinders - - - > store oxygen under high pressure (used to) 3.

7. I have (lost/been loosing) my note-book. Have you (seen/been seeing) it anywhere? 8. Someone has (eaten/been eating) my sweets. They are nearly all gone. 9. I have (waited/been waiting) for you for ages! Where have you been? 10.

A. Read the sentences and say how can form negations in present perfect I have been to London We have been to Washington You have been to Boston They have been to Chicago She has been to Australia He has been to the USA I have not been to Moscow We

Выберите правильный вариант. Gary has gone to / been to the baker's to buy some bread. Helen has never been in/been to Japan before. Alex has been in/been to Scotland for two months now and he loves it.