Why ______ we close that chemical factory?
Because it has caused lots of pollution. We need better environment.( )
must
can
may
They have to do a lot of work, ________ they?
()---Are you confident about the basketball match against Class 9, Yangyang? ----_________ I’ve got everything ready!
---- ______will Mrs. Lin go to Canada? ---- To see her daughter there.
-- _______is it from here to the station? -- It’s ten minutes’ ride.
--________ does your father visit your grandparents a week? –Once.