The policeman is still not sure the young man killed himself or was killed .

Some people maintain that watching violence on TV is one of the major causes of ______ behavior and crime in society. [ ]

The school makes a rule(规定) for the students to turn off lights at 10 p.m.

The mountain I visited last Sunday isn’t very________. Few ________ go sightseeing there.

I had travelled only two hours one day ______ the winds increased so much that I had to put my tent up _______ the winds became too strong[ ]