=>
28. B : nguyên nhân
29. C
30. A : Trên
31. D : vắc xin
32. A : khỏe mạnh
II/
33. My boyfriend loses his temper easily.
34. No matter how long you can use it, it won't wear out.
35. Get the work finished by lunchtime and you can go home.
36. How much progress have you made with your enquiries?
37. I needn't given Ted the message because he already knew about it.
38. The snow prevented the trains from running.
39. I didn't arrive early enough to see him.
40. I apologize for being rude to you yesterday.
