Work hard, ____________you'll catch up with your classmates next time( )
and
or
but
Mrs Black some flowers in the garden yesterday.( )
picks
picked
is picked
Lingling is than her sister.( )
tall
taller
tallest
David plays football but he doesn't play piano ( )
\,the
the,\
a,the
Mr Green is writing the blackboard.( )
in
on
at
I a middle school student ( )
am
is
are