31. it is disappointing that others have spoiled this area

32. tropical storms which known as typhoons occur frequently in asia

33. although shw has prepared everything, she is still worried 

34. mary is a hard working student 

35. edison, who invented the electric light bulb was a great science

36. looking after her little sister is hanh's responsibility

31.It is disappointing that others have spoiled this area.

32.Tropical storms which known as typhoons occur frequently in Asia.

33.Although she prepared everything,she still worried

34.Mary is a student.

35.Edison,who was a  great scientist invented a electric light bulb.

36.Looking after of her little sister is Hanh's responsible.