Put the verbs in brackets into the present simple or present continuous. 1. We are not sending out any orders this week because we are waiting for the new information.
2. If you add zero to any number, the quantity does not change.
3. We all know that circle of radius 1 has area π and circumference 2π.
4. Printers vary in cost, speed, print quality and other factors such as noise and compatibility.
5. Input devices allow you to enter information into the computer.
6. The number π plays central role in the study of trigonometry.
7. Professor Kshesinsky does not go to the lectures on Sunday.
8. The microprocessor coordinates the activities which take place in the computer system.
9. Look at the screen: it is getting darker.
10. You always are making a lot of noise.

Taras Shevchenko

Artist, poet, national bard of Ukraine, Taras Shevchenko was born on 9 March, 1814 in Moryntsi, Kiev gubernia. He was born a serf. When he was a teenager he became an orphan, and grew up in poverty. When he was 14, his owner, Engelhardt took him to serve as a houseboy. And Taras travelled with him to Vilnus and to St Petersburg. In Vilnus Taras for the first time heard different languages, Lithuanian, Russian and Polish and there he saw people whom their masters made free. When Engelhardt noticed the boys skiils in painting he apprenticed him to the painter Shiriayev for four years.

Shevchenko was an outstanding poet and a highly accomplished artist. There are 835 works written by him, although 270 are known to have been lost. His collection also contains over 150 portraits, 42 self-portraits. There are many landscapes, watercolours and etchings. The best is "A Dream" , "Haidamaki" , "Katerina" .

Объяснение:

1. Why were you angry with me yesterday? – I (was not).
2. Where were you last night? – We (were) at the theatre.
3. When I (came) to the bus stop, I (saw) a boy who (was playing) with a dog.
4. It (was) eleven o'clock, when I (decided) to go to bed.
5. What time did they ( have) dinner yesterday? – They (were having) dinner from seven till eight.
6. When she (saw) him a year ago she (did not  recognize) him.
7. I (was) very busy yesterday. I (was preparing) for my exam the whole day.
8. My brother (washed) the dishes while I (was sweeping) the floor.
9. Why did not you (see) a doctor yesterday?
10. It (was raining) heavily when he (went) out.