This is not my ping﹣pong _______/bæt/.It's Tom's.( )
A.butB.batC.beatD.boat
Tom with his friends _______ to Shanghai many times before.( )
have gone
have been
has gone
has been
Don't make noise in the hospital, _______?( )
do you
will you
won't you
don't you
It's important for us _______ to our teachers when we have problems.( )
to talk
talking
talks
talk
-Must I leave the reading room before 6o'clock?
-No, you _______. You can stay here until 6:30.( )
can't
needn't
mustn't
shouldn't
The woman _______ is the most important in my life is my mother.( )
which
what
whom
who