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: Many people have ____ symptoms until they suffer chest pains or a heart attack.\Question: Choose the right answer from options given a) three b) one c) no d) seven

SOLUTION: c

PROBLEM: Sexual maturity is reached at about ____ years of age.\Question: Choose the right answer from options given a) five b) ten c) no d) two

SOLUTION: d

PROBLEM: Butterflies have ____ pairs of legs.\Question: Choose the right answer from options given a) six b) four c) zero d) three

SOLUTION:
d