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: Antibodies contain ____ pairs of protein chains.\Question: Choose the right answer from options given a) no b) two c) nine d) zero

SOLUTION: b

PROBLEM: Ultrasonic liposuction fits into ____ categories.\Question: Choose the right answer from options given a) two b) seven c) nine d) one

SOLUTION: a

PROBLEM: Text files have ____ codes or formulas that are common in word processing and spreadsheet files.\Question: Choose the right answer from options given a) four b) five c) ten d) no

SOLUTION:
d