Full use should be _______the natural resources to combat the energy crisis.

Do you know Ann Watterson very well—Yes, she used to be ______ coach and in ______ charge of our school team.

missed the last bus and had no money for a taxi; so I could do nothing but_______ home last night.

The professor walked onto the platform and seated himself in a chair, ____ for answering questions

He stayed up too late every night,______ to catch up with his classmates.[ ]