58. 瞬间，他消失在人群中。

He disappeared in the crowd    .

57. 当时，学生们正在为第二天的考试做准备。

The students    the next day’s test at that time.

56. 在教室的前面有一块黑板。

There is a blackboard    the classroom.

55. We will remember the heroes (永远) .

54. He has read five novels (最近) .

53. It seems that nothing (使满意) him.

52. The boy is standing on the (宽) table.

51. Don’t say that. It isn’t your (借口).

50. Look!The clock is in the s of a heart.