V. C. Choose the right variant

1. They are (solve, to solve) mathematical problems very quickly. 2. You needn’t (to go, go) to the Institute today. 3. You are (have, to have) an English test next week. 4. You must (attend, to attend) the meeting. 5. You have (send, to send) a telegram. 6. I should (visit, to visit) the plant. 7. He was (meet, to meet) him at the station. 8. You may (to read, read) this article. 9. You should (keep, to keep) it secret. 10. You must (cross, to cross) the street here. 11. You ought (mend, to mend) your car. 12. He ought (to learn, learn) this rule. 13. He had (to help, help) his friend in Geometry. 14. You must not (go, to go) to bed late. 15. She had (take, to take) the book from the library.

V. D. Ask questions and answer negatively

e.g.: I spoke to Nick yesterday. - Did I speak to Nick yesterday. - I didn’t speak to Nick yesterday.

1. He wanted to get up early. 2. There was some milk in the bottle. 3. It rained here yesterday. 4. Some children will stay in town in summer. 5. She had dinner at five. 6. The water in the river will be warm in July.

V. E. Translate the sentences: 1. Вчера я ходил в кино, но фильм не понравился мне. 2. Сегодня я не обедала. А ты обедал? 3. Ты видел вчера Джейн? - Нет, не видел. 4. Шёл дождь в воскресенье? - Нет, не шёл. 5. У тебя красивое платье. Где ты его купила? 5. Это было глупо. Зачем ты это сделал?

V. F. Translate the following word combinations: environmental protection, main problems, contaminate land, water and air; become a universal problem, survival of our civilization, depend on the ability of mankind, find a way out, environment pollution, include soil pollution, caused by solid wastes; precious water, both industrial and domestic users, creates problems, water deficit, be polluted by garbage, poisonous chemicals, dump into lakes, underground water, harmful liquids, seep into the ground, fertilizers and pesticides, threaten air, safe to breathe, polluted air, burn coal, invisible gases, release into the air, mix with water, fall back to earth, acid rain, damage plants and forest, emitted gases, carbon dioxide, contribute to the greenhouse effect, protect the nature, be of primary importance, wild animals, establish pollution control

VI. A. Read the text Environmental protection and then discuss it

Environmental protection is one of the main problems of today. Through their daily activities people pollute and contaminate land, water and air. Today pollution has become a universal problem. The survival of our civilisation depends on the ability of mankind to find a way out.

There are several kinds of environment pollution. They include air pollution, water pollution, soil pollution, and pollution caused by solid wastes, noise, and radiation.

All life on Earth depends on the water. It's precious. Pollution of water by both industrial and domestic users creates the problem of water deficit. Rivers, lakes and oceans are polluted by garbage, or by poisonous chemicals which are dumped right into them. Underground water can be polluted by gasoline or other harmful liquids that seep into the ground. Some fertilizers and pesticides used on farms or lawns leak down through the dirt. Nuclear power plants threaten air, water and land.

Today the air is so polluted in some places that it's not always safe to breathe. Polluted air is not only bad for people and animals, but for trees and other plants, as well. When power plants burn coal to make electricity, and when cars burn gasoline, invisible gases are released into the air. Some of these gases can mix with water and make it acidic. Sometimes the gases get into rain clouds, where they get mixed in with rain or snow. Then the acid falls back to earth with the rain or snow. This is called acid rain. Acid rains damage water, plants, forest, and soil resources. Emitted gases and aerosols, carbon dioxide may contribute to the greenhouse effect.

The task of protecting the nature is of primary importance now. Greenpeace organisation created in 1987 carries out numerous campaigns against the global environmental pollution. The protection of natural resources and wild animals is becoming a political programme in every country. It is good that at last people started to realise that they should keep air and water clean by establishing strict pollution control.