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


question:
Water softeners add sodium to drinking water in ____ ways.\Question: Choose the right answer from options given a) zero b) six c) two d) nine
answer:
c


question:
Youngsters stay with their parents up to ____ years.\Question: Choose the right answer from options given a) four b) six c) no d) two
answer:

a