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6. When I came home, they had eaten the sweets.
7. We shall do the work in the evening.
8. He wrote this book in the 19th century.
10. They were playing tennis from 4 till 5.
11. He stole a lot of money from the shop.
12. By 6 o'clock they had finished the work.
13. At 12 o'clock the workers were loading the trucks.
14. By 3 o'clock the workers had loaded the trucks.
15. We send our daughter to rest in to the south every year. \
16. They will show this film on TV.
17. They are building a new concert hall in our street.
18. They have made a number of important experiments in this laboratory.
19. Sieving stone explored Central Africa in the 19th ' century.
20. By the middle of autumn we had planted all the trees.
21. They will stage this play at the beginning of next season.