Never lose much time _______ you should make use.

My bike is broken. May I go ______ yours—Sorry, mine _______ broken down.

had worked hard, you ______ so anxious now

Do you think you are ______ enough to fight with a tiger—No. Actually, I am afraid of all animals, even a small ant.

What did the young man come to your company for— He wanted a job, _______could help him support his family.