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: Collars come in ____ shapes.\Question: Choose the right answer from options given a) six b) two c) four d) zero

SOLUTION: b

PROBLEM: Lung disease is America's number three killer, responsible for ____ in seven deaths.\Question: Choose the right answer from options given a) five b) nine c) one d) four

SOLUTION: c

PROBLEM: Precocious puberty is ____ times more common in girls than in boys.\Question: Choose the right answer from options given a) four b) nine c) two d) one

SOLUTION:
b