We should ________ the best person for the job, and I feel Jane is a remarkable candidate.
You’d better _______ because I’m busy writing a letter to my parents.
Last month we students all had some great speeches. The headmaster together with some other teachers __________ to attend it, too.
---Is Johnson on duty today?---It ________ be him, but I’m not sure.
Mary’s mother told her daughter not to spend too much time surfing the Internet, but ______ didn’t help.
The firefighters would not allow anyone______ into the room on fire to collect anything.