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.