3. Прочитайте текст и ответьте на вопросы: 1. Which animals are endangered because of loss of habitat? (Какие животные находятся под угрозой исчезновения из-за потери среды обитания?)
2. Which animals are endangered because of global warming? (Какие животные находятся под угрозой исчезновения из-за глобального потепления?)
3. Which animals are endangered because of pollution? (Какие животные находятся под угрозой исчезновения из-за загрязнения)
4. Which animals are endangered because of hunting and poaching? (Какие животные находятся под угрозой исчезновения из-за охоты и браконьерства?)

1) Choose a or an: an opinion, an old dress, a class, a hand.

2) Choose the correct article before countable nouns.

1. I don’t have brothers or sisters.

2. I have a cousin. Do you have a cousin?

3. Write him a letter when you come back home.

4) Choose the correct article before uncountable nouns.

1. Could you pass me the salt, please?

2. The bread is stale.

3. Paper is made of wood.

5) Fill in articles before countable and uncountable nouns. Put ‘–’ for the zero article.

1. I am going out for a walk. I need some fresh air.

2. We need petrol. I hope we’ll come to a petrol station soon.

3. The soup isn’t salty enough. Could you pass me the salt, please?

Объяснение:

1. Because it was very difficult to build tall skyscrapers at that time and it was dangerous,it was difficult to get the necessary funds to build a skyscraper.

2. They can start building skyscrapers when they are sure that they have the right materials and the land is suitable for building a tall building.

3. When the Elevator was invented, people's lives became noticeably easier.And people were able to build taller skyscrapers.

4. Because it would be inconvenient to build them outside the city, especially since when building a skyscraper in the city there may be offices,shops,apartments, etc.

5. Because these buildings are built "to the sky".

6. It was built over two years, from 1929 to 1931.

7. Here you can find various cafes, shops, supermarkets and apartments, as well as much more.