№3. Choose the preposition. 1. Many animals are in/ under threat.
2. They adapted to/ in the dark conditions.
3. He was singing loudly to scare by/ off bears.
4. Wear more clothes instead of turning off/ up the heat.
5. They warned me about/ of his bad behavior.

1) Complex Object Fill in to or -.

1. I'd like you to join our game.

2. He doesn't want me to go out, it's too cold.

3. My parents don't let me (-) sit up late.

4. The pupils didn't cope with the test, were made to rewrite it.

5. I heard Nick (-) leave the room quietly.

6. Have you ever seen a monkey (-) teasing?

7. Ann is allowed to rewrite the test.

8. The teacher noticed Maggie (-) take her neighbour's notebook.

9. We would like the trade between our counries to develop.

10. He was made to earn his living at the age of fourteen.

11. Let Mary (-) put on her smart clothes and (-) go to the theatre with us.

2) Complete the sentences.

1. I would like you to finish it.

2. We saw Ann cross the street.

3. Mother expected me to come early.

4. Father let us play.

3) Write what George had done by the end of the summer. Use the word combinations below.

1. George was told to write five poems.

2. George managed to catch 28 fish.

3. George wanted to learn to ride a bike.

4. George didn't want to read 12 books.

5. George decided to teach his younger brother to play on the computer.

4) Put the verbs into the correct form, Past Perfect or Past Simple.

1. I had finished the work by 5 o'clock.

2. Last summer we went to the country.

3. The teacher understood that Lena had not done the task.

4. When Mum came home, I had already bought bread.

5. Mike gave me the letter which he had gotten the day before.

За сделано 25 предложений.

If you have even been inside the cockpit of a plane, you will have noticed the large number of instruments on the walls and ceiling around the pilot’s seat. Many of these buttons, dials and screens are used in navigation. Unlike car drivers, pilots do not have the luxury of signs and arrows telling them where to go. Instead, they rely on sophisticated GPS systems. So how were pilots able to find their way in the days before radio and satellite communication?

In the USA, the problem of navigation first arose when the airmail postal service was introduced in 1911. In the beginning, huge bonfires were lit to show pilots where to land in the dark. Later, a more practical solution was found: the construction of giant concrete arrows on the ground. The arrows were 21 m long and painted bright yellow. To enable pilots to see them at night, a steel tower with lights was built in the middle. The top light turned around to attract the pilot’s attention, and two others lit up the arrow and flashed a code to identify its location.

The first of these arrows was laid in 1924, and by 1929, there were around 1,500 of them. They formed an illuminated path for airmail pilots stretching from New York to San Francisco. The arrows were spaced about 16 km apart and were an important part of the Transcontinental Airway System. But by the 1940s, new navigation techniques were being discovered and soon, the arrows and their towers were no longer needed. They were gradually abandoned and some of them were removed completely.

However, not all of the arrows have disappeared. In the state of Montana, they are still used for guiding pilots through the mountains. Some are still visible in the empty areas of other states such as Utah, Wyoming and Indiana. Yet either because of their size or due to their bad condition, the arrows are not easy to find. In many cases, if you want to see one, it is a question of knowing where to look.

Which is where retired couple Brian and Charlotte Smith can help. The two are devoted fans of the arrows and spend much of their time hunting them down. So far, they have located more than a hundred of them. Once they find an arrow, they map its location, photograph it and upload the details onto their website. Their aim is to preserve the memory of these historical structures and prevent them from being lost forever.