chip, speed, figure out, calculating, reduces, microminiturization,
analog, logarithm, abacus, machine, vacuum tubes,
tiny, dependable, devised
1. The very first device used was 10 fingers of a man’s hand.
2. Then, the was invented.
3. J. Napier a mechanical way of multiplying and dividing.
4. Henry Briggs used J.Napier’s ideas to produce .
5. The first real calculating appeared in 1820.
6. This type of machine the possibility of making mistakes.
7. In 1930 the first computer was built.
8. This was the first machine that could mathematical problems at a very fast speed.
9. In 1946 was built the first digital computer using parts called .
10. The reason for this extra was the use of transistors instead of vacuum tubes.
11. The second generation computers were smaller, faster and more than first-generation computers.
12. The third-generation computers are controlled by integrated circuits.
13. This is due to , which means that the circuits are much smaller than before.
14. A is a square or rectangular piece of silicon, usually from 1/10 to 1/4 inch.
1. I (will do) my homework tomorrow. 2. I (will be doing) my homework at six o'clock tomorrow. 3. I (will have done) my homework by six o'clock tomorrow. 4. When I come home tomorrow, my family (will have) supper. 5. When you come to my place tomorrow, I (will be reading) your book. I (will have done) my homework by the time you come. 6. Don't come to my place tomorrow. I (will be writing) a composition the whole evening. 7.1 I (will not go) to the cinema tomorrow. I (will be watching) TV the whole evening. 8. What will you (do) tomorrow? 9. What will you (be doing) at eight o'clock tomorrow? 10. Will you (play) volley-ball tomorrow? 11. Will you (have done) this work by next Sunday? 12. When will you ( go) to see your friend next time? 13. How many pages will you (have read) by five o'clock tomorrow? 14. Tomorrow I (will begin) doing my homework as soon as I come from school. I (will be doing) my homework from three till six. My father (will come) home at seven o'clock tomorrow. I (will have done) all my homework by the time he comes, and we (will go) for a walk together.
2. When father (returned) from work, we had already (done) our homework.
3. When the teacher (entered) the classroom, the pupils had already (opened) their books.
4. Kate (gave) me the book which she ( had bought) the day before.
5. Nick (showed) the teacher the picture which he ( had drawn).
6. The boy (gave) the goats the grass which he ( had brought) from the field.
7. Mother (saw) that Nick ( had not washed) his hands.
8. The teacher (understood) that Lena ( had not done) her homework.
9. I (knew) that my friend ( had not yet come).
10. Tom (returned) from the cinema at five o'clock.
11. Tom ( had returned) from the cinema by five o'clock.
12. I ( finished) my homework at seven o'clock.
13. I ( had finished) my homework by seven o'clock.
14. He (thought) that he ( had lost) the money.
15. Ann (told) me that she ( had seen) an interesting film.
16. When I (woke) up yesterday, father had already (gone) to work.
17. Nick (thought) that his father ( had not yet come) home.
18. Mary (told) us that she ( had cooked) a good dinner.
19. Yesterday I (found) the book which I ( had lost) in summer.
20. When we (came) to the station, the train had already (left).