TASK DEFINITION: Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').
PROBLEM: Mares abort suddenly without signs of illness, and the fetus shows ____ signs of degenerative change.\Question: Choose the right answer from options given a) zero b) no c) seven d) ten

SOLUTION: b

PROBLEM: Children of alcoholics are ____ times more likely than other people to become alcoholics themselves.\Question: Choose the right answer from options given a) zero b) four c) nine d) two

SOLUTION: b

PROBLEM: Many animals use ____ or three forest structure types.\Question: Choose the right answer from options given a) eight b) two c) ten d) no

SOLUTION:
b