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: Evolution is dependent on ____ forces.\Question: Choose the right answer from options given a) no b) five c) two d) seven

SOLUTION: c

PROBLEM: Astronauts sleep only ____ hours each night, on average.\Question: Choose the right answer from options given a) six b) one c) four d) seven

SOLUTION: a

PROBLEM: Snow usually produces about ____ inch of water for every ten inches of snow.\Question: Choose the right answer from options given a) no b) four c) six d) one

SOLUTION:
d