—________ do you visit your grandparents?
—Usually twice a month.
How long
How often
How far
Our science teacher said that light much faster than sound.( )
traveled
travels
travel
You should come by eleven o'clock you want good seats.( )
if
whether
when
Daming wants to be a policeman when he up.( )
has grown
grew
grows
My home town is famous for its beautiful mountains and clear water.( )
more especial
especial
especially
The zoo asks the visitors the animals.( )
not feed
not to feed
don't feed