71.  Math is the answer.

72.  All that we can do is keeping quiet beside them, feeling inferior.

73.  Guqin is a kind of Chinese ancient music instrument which was heritage of Chinese culture.

74.  Many times, these fixed modes are not always right in reality.

75.  Guqin is a kind of Chinese ancient music instrument which was heritage of Chinese culture.

76.  Many times, these fixed modes are not always right in reality.

77.  The boy was her boyfriend!

78.  She was only a fresher who hasn't begun her university life!

79.  This is the third couple I saw this afternoon.

80.  She was my friend's friend.