—Listen! Is Mary singing in the next room?—No. It _______ be Mary.She has gone to Shanghai for an important meeting.
—I plan to go to a movie. Would you like to go with me? — _______ . That’s my favourite.
When he walked _______ my desk, he knocked my books _______ the floor.
After a short rest, the workers kept on _______ till midnight.
The ticket _____ him ¥20. And flying to the USA______him two days.
First, we must______ the bottle______ some water.