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.