61.  If we really don't need to discriminate men and women, nature must drop it in the long history and only preserve one kind of human.

62.  I must be doing something wrong.

63.  To begin with, I must study Integrated English Course for Postgraduates well and pass the Final exam.

64.  Firstly, I must set out to accumulate a large number of vocabulary day after day .

65.  On the other hand, too much car brings much pollution for the city which must not ignore.

66.  To fulfil , I must change my mind first , and use the procedures which fulfil the other two goals to enhance .

67.  In these ways , I believe my english ability must be improved.

68.  On the one hand, I must be seriously preparing my lessons.

69.  On the other hand, the homework and review are crucial in learning English, I must take these tasks seriously.

70.  But I know that only remembering some English words is not enough for a postgraduate and I must study further.