51.  but why didn't we put our hand, why?

52.  This must ask our students .

53.  It can cure our mistakes.

54.  I hope our classmates .

55.  We went into school from our joyful vacation.

56.  for our class .

57.  but why didn't we put our hand.

58.  this s tesk our students.

59.  I hope our classmates know this question too and changed it.

60.  96. Some of our classmates often waste their time.