--- May I speak to your manager Mr. Williams at five o’clock tonight?
--- I’m sorry. Mr. Williams        to a conference long before then.

Many a student _____ going to attend the meeting tomorrow.

These days, we _____ for our final exams.

Until we have discussed all the details, no decision _______ about any new operations.

Jack could have avoided that terrible car accident, but he ________ careful enough.

-----_____ leave at the end of this month.
-------I don’t think you should do that until _____ another job.

He is the only one of the students who _____ a winner of scholarship for three years.

The best way to prevent the air polluting _____ , but the sky is still not clear.

The ambulance was just arriving, for a worker, who ______ the window on the second floor, fell off the window.    

–What did you say?
--So you _____________ to me.