36. Because there are about fifty million people have to go to doctor because of headache

37. They can see black dots or bright spot in front of their eyes.

38. Yes, they may

39. When they work too hard or they too nervous about something.

40. By changing their diets or their lifestyle or simply by going to bed.

41. My sister drinks less coffe than my brother

42. Even though our flat is very noisy, we enjoy living in it

43. Although the weather is bad, they had a wonderful holiday. 

44. Spending the weekend in the countryside is very wonderful.

48. Ha fell her English Test ,therefore she had to do the test again

VI

27. actor/ actress

28. Weight

30. invention

VII

31. His computer is more expensive than mine

32. I like drinking apple juice. ...

33. I and some of my classmate go to school by bus ...

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