16. Is she beautiful enough to become Miss World?

17.He spent two hours finishing his Math exercises

18. Nam told Lan to show him her photos

19. It's essential to practice English everyday

20. We have participated in the science club since last year

21. My sister asked me how that machine operated.

22. Nam is not as tall as his father

23. She used to eat a lot of candies.

24. I haven't eaten Chinese food since i got allergic reaction

25. She has studied English for two years

26. Madison advised me not to put my books on the chair

27. The folktale has a meanful ending.

28. Hoa is more intelligent than Mai

29. My father used to smoke a lot

30. It's dangerous to swim across this river

    Xin ctlhn nhé<3