Which of the listed below statements are true/false. Specify your
answer using the text.
1) When computers were first introduced in 40's and 50's programmers had to write
programs to instruct CD-ROMs, laser printers and scanners.
2) The operational system controls and manages the use of the hardware and the
memory.
3) There are no commands available in operating systems, they are only in word
processors.

Exercise 3. Complete the sentences. Use the correct affirmative or negative form of the Present Perfect.

1. I saw an alien last night! But I have not told my mum.

2. 'Where's my pencil?' 'Jane has taken it.'

3. It's the last day of my holiday, and I have written postcards to all my friends.

4. John can't play tennis today. He has lost his tennis shoes.

5. 'You have eaten all of the pizza!'

6. He isn't very tired. He has not run as far as me.

7. Oh, no! I have not done my homework!

Exercise 4. Use the correct form of the Present Perfect.

1. Have you been to Great Britain?

2. Have you finished your test?

3. Have all the students prepared the text for retelling?

4. He has just graduated from the mining department of the university.

5. He says he has never seen the girl before.

6. Unfortunately, I have not seen the film.

7. Have you ever travelled to the USA?

8. She says she has changed her mind.

9. They say they have never been at this place before.

10. Nobody has seen  him today.

Когда я (1) ………. …………… ..…… шел домой из школы вчера, я чуть не увидел аварию .. Было много машин и они ехали очень быстро. Я видел двух мальчиков (2) ………………………… ..… ... играли в футбол и один из них пнул мяч в дорогу. , Я (3) ………………………… ..… ... идти по опасной дороге Мальчик пошел за мяч, и он побежал прямо перед (4) ………………………… ..… ... машина, которая внезапно остановилась. Никто не пострадал, кроме водитель был очень зол. Он сказал, что там повезло (5) ………………………… ..… ... произошел серьезный несчастный случай.

Объяснение:

Прости только этим