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: Perennial grass takes three to ____ years before it is mature enough to produce adequate seed.\Question: Choose the right answer from options given a) five b) seven c) six d) four

SOLUTION: a

PROBLEM: Pups remain in the den for about ____ weeks, and are cared for by the entire pack.\Question: Choose the right answer from options given a) ten b) three c) six d) no

SOLUTION: c

PROBLEM: Corals usually are less than ____ feet long.\Question: Choose the right answer from options given a) no b) three c) ten d) zero

SOLUTION:
b