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Giúp mình với 
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6. The children water the trees every two days.
7. They mentioned Jim in their conversation.
8. My mother is preparing dinner at the moment.
9. She returned the money last night.
10. Mother did not serve dinner.
11. They cannot hold the meeting in that room.
12. No one will buy products with poor quality.
13. I think we will use up the natural resources.
14. Have anyone heard of Jim and Jane's luxury wedding?
15. What will they do to prevent natural disasters?