41. Which ativity uses more calories, walking or riding a bicycle?

42. Last summer, I provided the English evening classes for twenty children.

43. My mother often donates money to the charitable organisations.

44. A good knowlegde of music and arts is regarded as necessity for anyone who wants to be truly educated.

45. Do you think the students are actually better at more academic subjects than others?

46. The machine will do all the work for us in the future.

47. The school children are planting flowers and trees in the garden.

48. You should reduce the amount of the electricity your family uses.

49. Could you tell me how to get to the nearest supermarket ?

50. The ice near the Poles may melt and may cause a lot of serious floods.