–Look! The man at the gate ____ be our headmaster. He is always standing there every morning.-- No, it _____ be him. He is holding a meeting in the office now.
- The air pollution is terrible. - It will be worse ________ we take action to protect the environment.
______ he talked with her for a long time, he failed to convince(说服)her.
Mr Smith usually reads a newspaperhe’s waiting for the bus.
Many teenagers think they ____ to play computer games on weekends.
The meeting is important that you mustn’t miss it. (盐城)