9. The flowers were planted in front of the house
10. I haven't seen him for two days
11. Because Lan worked hard, she passed the exam
12. I used to walk to school when I was a little girl
13. I have learned English since 2001.
14. Mr Hung has worked in this factory for 2 years
15. The problem can be solved by us
16. Water has been discovered on Mars
17. People wish the weather weren't awful today
18. We have learned English since 2005
19. The homework has already been done by these students
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