I soon found that the work I was doing had already been done by someone else —________ I was wasting time.
15. In an emergency, you should remain _____.
14. It was a _____ evening and I really had a good sleep.
13. The foreman(工头) beat him _____ , and the other workers were very angry with him.
12. Although he was not _____ tired, he didn’t care _____.
11. How time flies! You should make _____ use of your time.