51.  I think firstly we should not waste water.

52.  We can't waste fresh water any more in the first place.

53.  Don't waste water because water is our lives.

54.  Secondly we shouldn't waste fresh water.

55.  Every mustn't waste fresh water.

56.  To reach our desire, we must oppose the action of wasting fresh water.

57.  Without water, we can't live more than seven days.

58.  Hence, we should not waste the water.

59.  We can't waste water.

60.  We shouldn't waste water.