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: Most internal parasites are specific to one or ____ species.\Question: Choose the right answer from options given a) seven b) three c) two d) five

SOLUTION: c

PROBLEM: Antibodies contain ____ pairs of protein chains.\Question: Choose the right answer from options given a) no b) two c) nine d) zero

SOLUTION: b

PROBLEM: Most geckos live for about ____ to ten years.\Question: Choose the right answer from options given a) four b) nine c) three d) no

SOLUTION:
a