IV. Say whether these sentences are true or false: 1. Alternating force always exerts its effort in one direction.

2. Alternating force is produced by electromagnetic induction.

3. The electromotive force is induced by motion of a conductor.

4. Resistance is an important factor that greatly influences electrical flow.

5. The type of the material employed doesn’t influence the resistance

Most of all I like summer holidays because they are the longest ones. Now I’d like to tell you about my summer holidays I spent in Crimea.It was the first time I’ve been there. I’ve been dreamed to visit Crimea for many years but our family couldn’t afford this. This summer my father said we can go to the Black sea. I couldn’t believe my ears. I asked him again if he is serious, but he said he already purchased tickets on the train to Simferopol.On 5th July we left Kiev and went to Simferopol by train. Our destination was Alushta, so from Simferopol to Alushta we went by trolley-bus. As soon as we reached Crimean Mountains, I was stunned by the scenic views that I only saw in pictures. The road looped between mountains and soon we reached the Angarsky pass. It was the highest point on our road, so then we started to descend and finally we arrived to Alushta!Alushta is one of the largest towns in Crimea. It’s situated on the seaside between high beautiful mountains. Of course, the main treasure of Alushta is magnificent Black sea!It was a splendid time. We swimmed, walked by seaside, and visited many sights. Excursion to the Valley of the Ghosts, which is situated near Alushta, amazed me the most. The Valley of the Ghosts is surreal landscape of giant stone pillars that were sculpted by wind erosion. It was incredible sight, because I’ve never seen anything like this!Also we’ve visited the Dzhur-Dzhur waterfall, the Marble Cave, and the Red Cave. Marble Cave has several underground halls with stalactites and stalagmites of fantastic shapes, resembling people and animals. The Red Cave has an underground river.Those days were amazing and unforgettable; I wished if I had more days to spend over there. My holidays were exciting and full of joy. I enjoyed immensely. I think that Crimea is a real paradise on earth. I dream to visit it again.

1. The pupils discussed) this problem yesterday .2. The pupils were discussing this problem the whole evening yesterday. 3. They (were discussing this problem from three till five o'clock. 4. They were discussing this problem at four o'clock yesterday. 5. They were discussing this problem when I came in. 6. She learnt a poem yesterday. 7. She was learning a poem at five o'clock yesterday. 8. She was learning a poem from five till six o'clock yesterday. 9. She was learning a poem when mother opened the door. 10. She was learning a poem the whole day yesterday. 11.1 did not see) him yesterday. I saw him two days ago. 12. She was not writing a letter at seven o'clock yesterday. She  wrote) it two days ago. 13. Jane was reading the magazine from five till six o'clock last evening. 14. He studied a rule in the morning last Monday. 15. Last month our team lost the game. 16. What was she  doing when the telephone rang? 17. Whom were they  speaking to when I met them at the station? 18. They were having lunch when the telephone rang. 19. Nick was making a report at three o'clock yesterday. 20. Mike was writing on the blackboard when I came into the classroom. 21. She was not sleeping the whole night yesterday. 22. Who entered the room when you were watching television? 23. What were you  thinking about when I asked you a question?