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1. I WATCH TV at seven o’clock every evening. 2. I WATCHED TV yesterday. 3. She DOES her morning exercises very often. 4. She DID her morning exercises yesterday. 5. I usuallyWALK to university but yesterday I TOOK a taxi. 6. As a rule my mother COOKS dinner but yesterday she INVITED us to the restaurant. 7. He DOESN'T LIKE coffee but yesterday he DRANK a cup of coffee as he WAS very tired. 8. They ARE in Moscow now but last week they WERE in New York. 9. He usually SLEEPS well but last night he SLEPT badly. 10. She PLAYS tennis every weekend but last weekend she DIDN'T PLAY tennis, she WORKED in the garden.

These days people cannot imagine their lives without modern technologies in particular without a computer.Computer has become a vital part of human life. It is an obligatory tool of human development. Every major and minor industry is computerized. Computers do their jobs efficiently, fast, and productively. No doubt they have made our lives much easier.. But the problem is that together with the positive effects of the computers they also have negative impact on human beings..Many people whose jobs are connected with computers complain on health problems such as headaches, RSI, backache, poor vision. Moreover, spending a lot of time at the computer results in eating a lot of foods which in its turn leads to the obesity.The group, which is most at risk, is young children.