---Look. The man at the gate _____ be our headmaster. He is always standing there every morning.---No. it ____ be him. He is having a meeting in the office now.
Everybody should study hard. No one can _______ us _______ a good future.
There’s water all over the kitchen. You’d better _______ right away.
I saw a number of pancakes in the plate, but now there is _______ left in it.
— Would you like to attend China’s Got Talent《中国达人秀》? — _______, but I’m busy preparing for my test.
What action should they _______ such a thing happening again?