1. many wildlife habitats will be destroyed, if man keeps (keep) polluting the environment. 2. if we dump all sorts of chemicals into rivers, we will not be able to (not be able to) swim in them in the future. 3. if we don't stop (not stop) cutting down so many trees, we will endanger our oxygen supply. 4. if the global temperature (rise) too. (rise), sea levels 5. people (run out of) drinking water one if they (not use) it more rationally. 6. if a human (want) to help the planet, then he (have to) change his habits.​

Many people in the world use English as a natiVe language. English is spoken in many countries all over the world. The number of English native speakers is between 300 and 500 million people. As an official language English is used in business, government, and law. As a world language is used in Canada, in the Republics of South Africa, in the Irish Republic and in many other countries. English expands its vocabulary by borrowings from other languages. American English is the form of English used in the United States.

Would you like some apple juice ? -Yes, please. I'd love to -No, sorry . I haven't got any apples. But I have got  some  oranges . - I'm afraid,I don't want any oranges. I would like apples. -Mag , is there any bread at home ? -No, there is no bread at home. -I hope you'll go and buy some. 

Хотите яблочный сок? -Да Я хотел бы, нет, извините. Я у меня нет яблок. Но у меня есть несколько апельсинов. - Боюсь, я не хочу, апельсинов. Я хотел бы яблоки. -маг, есть ли хлеб в дома? -Нет, нет дома нет хлеба. -Я надеюсь, что Вы пойдете и купите. хлеб в магазине.