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: Acoustic guitars come in ____ types.\Question: Choose the right answer from options given a) two b) ten c) one d) four

SOLUTION: a

PROBLEM: Toenails are similar , except that they grow ____ times slower and are on the toes .\Question: Choose the right answer from options given a) two b) eight c) six d) four

SOLUTION: d

PROBLEM: Antibodies exist as one or more copies of a Y-shaped unit, composed of ____ polypeptide chains.\Question: Choose the right answer from options given a) eight b) four c) ten d) nine

SOLUTION:
b