13. The elbows on your coat have worn thin, so I must ____them.
A. mend B. patch C. repair D. pitch
14. ____and wage increases have not kept in step.
A. Production B. Product? C. Produce D. Productivity
15. People under stress have performed____feats of strength, like lifting an automobile off an accident victim.
A. specific B. extraordinary C. abrupt D. abnormal
16. Modern appliances____us from a good deal of household work.For instance, the dryer frees us from hanging the laundry.
A.escape B . benefit C. liberate D. comfort
17. The audience waited in____silence while their aged speaker searched among his note for the figures he could not remember.
A. respective B. respect C. respectful D. respectable
18. The disappearance of her paper has never been ____.
A. counted for B. looked up ? C.accounted for D. checked up