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: Mountain goats have ____ sharp horns.\Question: Choose the right answer from options given a) two b) six c) ten d) four

SOLUTION: a

PROBLEM: All mass spectrometers consist of ____ distinct regions.\Question: Choose the right answer from options given a) three b) one c) two d) zero

SOLUTION: a

PROBLEM: All birds have two legs with ____ toes each.\Question: Choose the right answer from options given a) four b) six c) one d) zero

SOLUTION:
a