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
19. When he was asked about the missing briefcase, the man ____ever seeing it.
A. refused B. denied C. opposed D. resisted