—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
After the class was over, the student apologized ______ the teacher _____ his coming late.
Mr. White ________ at 8:30 for the meeting, but he didn’t turn up.
On Halloween, children in America like to _____ as ghosts to frighten people.
The little boy has not the ______ to lift the heavy box.
I am looking forward to ______ your answer as soon as possible.