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 comets have ____ tails.\Question: Choose the right answer from options given a) two b) six c) three d) one

SOLUTION: a

PROBLEM: Circumcisions usually heal within ____ to two weeks.\Question: Choose the right answer from options given a) one b) five c) eight d) nine

SOLUTION: a

PROBLEM: Copepods are so numerous that it is estimated that they compose ____ out of every ten zooplankters.\Question: Choose the right answer from options given a) one b) seven c) two d) zero

SOLUTION:
b