50. The climate is mild t_____________ the year.

49. Whether we can go camping d____________ on the weather.

48. Jackie Chan is a w____________ film star.

47. As she ate more than necessary, she was putting on w___________.

46. We can protect the environment by r____________ waste gas from cars and factories.

45. His speech was so a______________ that no one noticed the time.

44. Waste gas is h____________ to our health.

43.The speaker gave us a b__________ introduction to DNA.

42. The party was well o_______________.

41. Do you know the exact a_________ of money he spent on his holiday?