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: Atoms are extremely small, on the order of a few ____ billionths of a meter.\Question: Choose the right answer from options given a) ten b) seven c) nine d) eight

SOLUTION: a

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: Rabbits are meticulous groomers who shed every ____ months.\Question: Choose the right answer from options given a) three b) no c) one d) two

SOLUTION:
a