57. 当知道她赞同我们的观点时，我很激动。

Pm excited when I know she  us.

56. 开会时保持安静是重要的。

It’s important at the meeting.

55. Please draw two (线) across the page.

54. I ( 想知道) if Tom has been to the Great Wall.

53. The houses were (毁坏) in the big earthquake

52. He is an (不出名的) man,but we all respect him.

51. When saw him,he was (解释) some questions to his students.

50. It is t . It’s raining all day.

49. I'm really p when I heard I passed the English exam.

48. The k are used to cut the fruits.