As we all know, using public chopsticks______necessary when we eat with others.( )
is
are
was
By the time the teacher came, we ______ cleaning the classroom.( )
finished
have finished
had finished
_____ walk on the grass.( )
Doesn't
Don't
Not
The coat looks very nice. Can I _____?( )
try it on
try on it
try them on
We all like comedies _____ make us relaxed.( )
who
that
whom
Listen to me _____, or you can't follow me.( )
care
careful
carefully