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: Some European countries require ____ years of education.\Question: Choose the right answer from options given a) no b) nine c) six d) three

SOLUTION: d

PROBLEM: Some species can make dives over ____ hundred feet deep.\Question: Choose the right answer from options given a) six b) eight c) two d) one

SOLUTION: b

PROBLEM: Kittens have baby teeth which are replaced by permanent fangs at around ____ months of age.\Question: Choose the right answer from options given a) zero b) three c) seven d) nine

SOLUTION:
c