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11. They had wrapped the package carefully before they posted it.
12. Children should treat old men with respect.
13. The computer can do all the accounts.
14. They are going to build a new school.
15. He isn't going to buy that house.
16. They will pull down that building
17. The teacher won't correct the exercises tomorrow.
18. You have to keep dangerous chemicals in the safe place.
19. Police had to break the meeting up.
20. They may use that room for the classroom.