1) If Peter (come), we (go) to play in the yard.
2) If you (eat) late at night, you (get) a stomach ache.
3) I (watch) TV if she (not come).
4) If Frank's parents
(have) their holidays in summer, they
(go) to the seaside.
5) She (go) to the cinema when she (finish) my work.
6) We (buy) this book if our mother (give) us some money.
7) I (return) you your dress when you (ask) me.
8) If we (not get) enough sleep, we (feel) tired tomorrow.​

1. Nina celebrated her birthday yesterday. Her room looked beautiful, there were many flowers in it. When I came in, somebody was playing the piano, two or three pairs were dancing. 2. Listen! Somebody is playing the piano. 3. I  like music very much. 4. When I  looked out of the window, it was raining heavily and people were hurrying along the streets. 5. What  were you doing at seven o'clock yesterday? — I was having supper. 6. When I  came home yesterday, I  saw that all my family was sitting round the table. Father was reading a letter from my uncle who  lives in Paris. 7. Where were you  yesterday? — I was at home the whole day. — How strange. I rang you up at two o'clock, but nobody  answered. — Oh, I was in the garden. I was reading your book and did not hear the telephone. 8. What wereyou  doing at five o'clock yesterday? — I was working in the library. — I was there, too, but I did not  see you. 9. Yesterday I was working at my English from five till seven. 10. It was raining the whole day yesterday. 11. Where is your sister  now? — She is in her room. She is doing her homework.

     Belka and Strelka were most usual dogs of the Soviet Union.But they have become famous all over the world.These two dogs together flew into space and did a couple of turns around the Earth's orbit.This happened even before the first space flight of people before Yuri Gagarin.
     Scientists wanted to see how the animals feel before you send people into space first.Belka and Strelka planted inside and launched a satellite into orbit.The flight was difficult and dangerous, because then scientists have not really know what is happening and how a living organism in orbit.But dogs are well behaved and obedient, only barked loudly, seeing the Earth through the porthole.
     Belka and Strelka were flying in space more than a day, and then landed safely.They rejoiced worldwide.