—Tina, is that our math teacher Mr. Wang?
—It ________ be Mr. Wang. He has gone to Beijing.
must
mustn’t
can’t
can
We need to ______ after eating to have good teeth.
I like the fruit salad because it ______ nice.
—How long does it take you to go to the bus station? —______.
Cindy is good at .She wants to join the sports club.
There is ______ rice or bread in the bag.