—Who’s singing in the garden?—It _____be Mr. Brown. He always practices singing at this time.A. must B. can’t C. need
If we try our best, our dream will one day.
We don’t know _______ the meeting will be held soon.
--I’m worried about my English. -- ______ harder ________ you will catch up with your classmates.
I can’t go to the cinema with you because I _______ stay here until my mother comes back.
Let’s have_________ break; I want to make________ telephone call.