g Man used fire for cooking food and also for light, warmth and ________ wild beasts.

If you don’t know ________ these problem, you may turn to me for help.

Would you like to go out for a walk withus —_____, but I must finish my homework first.

ou machine, you can either read the user’sguide for guidance or fax us for specific instruction. Don’t ______ thetrial-and-error method.

Why does Sara know so much about Angkor Wat?—She _______ there,or she may have read about it.