Укажите последовательность наступления сумерок в городах:
• Вашингтон
• Санта-Фе-де-Богота
• Гавана
• Оттава

 Допишите ядерную реакцию: 1327Al+612C → 01n+24He+......

Допишите ядерную реакцию: 919F+...... → 816O + 24He.

В чем сходство обмена веществ птиц и человека

2 ЗАДАНИЯ ПОМОГИТЕ РЕШИТЬ .

Упр. 194. Раскройте скобки, употребляя глаголы в Past Simple или Past Continuous.

1. At this time yesterday I (to sit) at the theatre. 2. He (to come) back to St. Petersburg on the 15th of January. 3. I (to go) to the institute when I (to see) him. 4. At this time yesterday we (to have) dinner. 5. He (to write) a letter when I (to come) in. 6. He (to make) a report when I (to leave) the meeting. 7. Yesterday he (to write) a letter to his friend. 8. When I (to look) at them, they (to smile) at me. 9. What you (to do) at six o'clock yesterday? 10. I (to go) to bed at half past eleven. 11. Yesterday the lesson (to begin) at nine o'clock. 12.  The cat (to take) a piece of fish and then (to run) away. 13. He (to read) a newspaper when I (to come) in. 14. Yesterday I (to get) up at seven o'clock. 15. The train (to start) at fifteen minutes to ten. 16. He (to put) on his coat and cap, (to open) the door and (to go) out.

Упр. 195. Раскройте скобки, употребляя глаголы в Past Simple или Past Continuous.

1. I (to feed) my cat with fish yesterday. 2. What you (to do) at four o'clock yesterday? I (to feed) my cat. 3. What your brother (to do) yesterday? He (to play) computer games. 4. I (to begin) repairing my camera at six o'clock yesterday. 5. At five o'clock yesterday Helen (to cook) soup. 6. We (to play) badminton from nine till eleven yesterday. 7. Kate (not to go) for a walk yesterday. She (to write) a composition the whole day yesterday. 8. When your father (to come) home yesterday? He (to come) home at seven o'clock. 9. When my father (to come) home yesterday, my mother (to make) supper. 10. We (not to go) on a tramp last summer. 11. What you (to do) when your sister (to come) home yesterday? 12. You (to have) supper at nine o'clock yesterday? 13. He (not to go) to the shop yesterday. 14. Nick (to go) to bed at ten o'clock yesterday. 15. Rick (to sleep) at eleven o'clock yesterday. 16. When we (to play) in the yard yesterday, it suddenly (to start) raining heavily. 17. I (to see) Mike when he (to cross) the street. 18. He (to begin) repairing his bicycle in the morning yesterday. 19. He (to repair) his bicycle the whole day yesterday. 20. He (to finish) repairing his bicycle in the evening yesterday.