用下面所给的词语的适当形式填空 at before reason watch attend as while more

用下面所给的词语的适当形式填空
at before reason watch attend as while more take the
Television has ( )the place of schools as the main educator in Americans.There are several ( )for this.First,there is( )number of hours.( )Americans spend about 13,000 hours in schools,they spend 15,000 to 16,000 hours in front of a TV set.Second is the age at which viewers start( )TV.People start watching and understanding TV( ）about the age of 3,which is several years( )they start to do school work.Finally
there is the number of viewers .About 90,000,000 young people are ( ) school,but ( )of the Americans watch TV every day.It seems that TV shows are taking the place of teachers and proffessors ( ) the education in Amrica.