28.D
29.B
30.A
31.C
32.B
33. Lan suggested going out for a walk.
34.He has studied Chinese for five years.
35.If I were you,i would study harder for the exam.
36.My dictionary isn't as expensive as yours.
37. I wish I could play the piano.
38.Although i admire her achievements, i don't really like her.
39.This is the best essays she has ever written before.
40.It's rainning heavilly so we cancelled our journey.

=>
28. D ( when I heard fire engines with loud alarm bells)
29. B ( I quickly ran out and, a few streets away)
30.  A kinh khủng, khiếp sợ
31. C ( the firemen in their uniform) 
32. B firemen's 
33. Lan suggested going out for a walk.
34. He has studied Chinese for five years.
35. If I were you, I would study harder for the exam.
36. My dictionary isn't as expensive as your dictionary.
37. I wish I could play the guitar.
38. I don't really like her although I admire her achievements.
39. This is the best essay she has ever written.
40. It's raining heavily, so we cancelled our journey.