—Tina, is that our math teacher Mr. Wang?
—It ________ be Mr. Wang. He has gone to Beijing.
must
mustn’t
can’t
can
He learnt English by ______English songs.
If you don’t know a word, you must _______in a dictionary.
He likes telling funny jokes, so I never felt __________ with him.
Every day we __________ too much time on our homework.
To watch the sun rise. Many people __________ the top of Mount Tai early.