71.  They make good use of the time to study hard.

72.  I will make good use of time, go over my lessons earnestly.

73.  Since television has so many advantages, we should make good use of it to serve our everyday needs.

74.  Although some programs on TV really do harm to the viewers, such as the children, it is not television that ought to be responsible, instead, it is us users who should make good use of it.

75.  So we must protect the nature scientific and make good use of it.