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goida82
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put in during, for or since (вставьте нужное слово).
1. we went with our experiments … a year. … this period of time it became clear that our approach had some disadvantages.
2. many problems were discussed … the conference and some of them … many hours. … the discussion different suggestions were made. the conference continued … a week.
3. biology made great progress … the second half of the xix century and … some time it was supposed that there is nothing much to be discovered.
4. man … thousands of years has been changing the world to suit his own purposes.
5. man has been changing the world … ancient times.
6. our team has been doing plasma research … three years.
7. he has been investigating the cell properties… he joined this laboratory.
8. i have been working at the effects of low temperatures on seeds… half a year.
9. we have been studying the theory of chromosome hereditary… last two years.
10. i have been gathering these data … last winter.

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kateryna264
kateryna264
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