71.  Most of them are youth.

72.  When I was in the middle school, most of my English result is on 90 or more, but now I did not try to be on 90.

73.  Most of the people don't realize that, but now you must learn this serious problem .

74.  We spend most of our time in studying .

75.  Because when we finish our four-years studying , most of us will begin to work .

76.  First, most of them can watch color TV in their comfortable houses second , they can work by machine instead of by hand.

77.  In truth , most of them go to work-place by bike, it is even quicker than bus when it have a bad traffic jam .

78.  A student's energy is limited if he spend most of time, doing the job, he won't have time to study .

79.  Most of us have certain kinds of bed habits we are ashamed of.

80.  Most of us complain there's little chance to learn about the society , so we manage to do some social work.