51. Please help me to answer this question, thank you!
52. have bravery to speak to people, called on they attened this instructive deed .
53. I hope in this surrounding .
54. This action is bitter and tired.
55. This action is a instructive.
56. know this question too and changed it .
57. This radio isn't a ordinary radio.
58. This function was very useful .
59. this s tesk our students.
60. I hope our classmates know this question too and changed it.