Every one of the following questions consists of a related pair of words, followed by five pairs of words. Choose the pair that best represents a similar relationship to the one expressed in the original pair of words.
16.  PULSATE : THROB
A. walk : run
B. tired : sleep
C. examine : scrutinize
D. ballet : dancer

17.  FISH : SHOAL
A. wolf : pack
B. elephant : jungle
C. beagle : clan
D. herd : peacock

18.  ODOMETER : DISTANCE
A. scale : weight
B. length : width
C. inch : foot
D. mileage : speed

19.  WAITRESS : RESTAURANT
A. doctor : diagnosis
B. actor : role
C. driver : truck
D. teacher : school

20.  SKEIN : YARN
A. squeeze : lemon
B. fire : coal
C. ream : paper
D. tree : lumber