1.Watching boring TV shows is simply a _waste_____(浪费)of time
2.Sleeping too late will certainly do__harm___(危害)to your health
3.It's wrong of people to___turn___(使成为)the lakes into farmland
4.The trip __contains____(have something as a part)a visit to the museum and climbing up the hill
5.They have a good way to___decrease/reduce/cut down____(make something less in size,price,etc)the cost of the project
6.They finally___understand______(get to know or understand)what they should do for their future.