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: Copper is ____ times higher in dog liver than in human liver.\Question: Choose the right answer from options given a) three b) ten c) six d) one

SOLUTION: b

PROBLEM: All butterflies go through ____ distinct stages in their lives.\Question: Choose the right answer from options given a) eight b) seven c) four d) three

SOLUTION: c

PROBLEM: Close relatives give up to ____ animals, others one or two.\Question: Choose the right answer from options given a) six b) two c) seven d) ten

SOLUTION:
d