—Tina, is that our math teacher Mr. Wang?
—It ________ be Mr. Wang. He has gone to Beijing.
must
mustn’t
can’t
can
It’s _______ Andy to plan everything well.
Bill’s mother ________ much time in cooking every day.She can cook delicious food.
Teachers should give students the way to learn ________ giving them the answers.
Listen! Do you hear the little girl ________ the violin in the next room? It sounds beautiful.
There ________ lots of trees on both sides of this street.But now they are all gone.