When a plane has passed all the tests it can get a government certificate of airworthiness without which it cannot fly.

Making the working parts reliable is as difficult as making the structure strong enough. The flying controls, the electrical equipment, etc. must not only be light in weight, but must work both at high altitudes where the temperature may be below freezing point and in the hot air in the tropics.

To solve all these problems the aircraft industry has a large number of research workers, with elaborate laboratories and test houses. And new materials to give the best strength in relation to weight are constantly being tested.

Ответьте письменно на вопросы по содержанию текста.

1.What are two main things in aircraft engineering?

2.Why has the structure of the aircraft to be as light as possible?

3.What is the way of testing of the airplane?

4.What is a government certificate of airworthiness?

Раскройте скобки,употребляя глаголы в требующемся времени.

1. When morning came, the storm already (to stop), but the snow still (to fall).

2. I (to wait) for permission to go abroad for three weeks already, but I (not to reseive) the visa yet.

3. Everybody (to be) at the door of the museum, but my friend (not yet to come).

4. Light (to travel) more quickly that sound.

Употребите правильную форму глагола в пассивном залоге.

1. You (advise) to wear warm shoes in winter.

2. The time before bed (spend) very pleasantly.

3. Sniffer dogs (use) by police to detect drugs and explosives.

4. Huge pine trees (uproot) by the storm.

Перепишите предложения,начиная с данной фразы. Обратите внимание на согласование времен.

Напр.,You will fall and break your leg.(I was afraid)-I was afraid that you would fall and break your leg.

1. The children are playing in the yard. She trought______

2. Her friend will come to see her. She hoped______

3. Father has repaired his bicycle. He trought______

4. She knows English very well. Isupposed_______

Повелительные предложения в косвенной речи. Перепишите предложения в косвенной речи, обратите внимание на изменение местоимений.

1. "Give me a cup of tea,please", said my mother to me.

2. "Don't ask me such stupid questions", said Susan to him.

3. "Open your books at page ten", said our teacher to us.

4. "Don't make so much noise", said mother to her children.

Переведите на русский язык.

1. I have not written the composition. I shall have to write it on Sunday.

2. We did not have to buy biscuits because granny had baked a delicious pie.

3. Will you have to get up early tomorrow?

4. I had to do a lot of homework yesterday.

Дата добавления: 2015-10-16