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 bioluminescence is blue for ____ reasons.\Question: Choose the right answer from options given a) seven b) two c) four d) zero

SOLUTION: b

PROBLEM: Sexual reproduction involves ____ individual organisms.\Question: Choose the right answer from options given a) six b) no c) two d) nine

SOLUTION: c

PROBLEM: Western medicine uses ____ approaches, drugs or surgery.\Question: Choose the right answer from options given a) four b) two c) ten d) nine

SOLUTION:
b