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 motors contain ____ gears and spin very fast, and have little if any torque.\Question: Choose the right answer from options given a) four b) three c) five d) no

SOLUTION: d

PROBLEM: Mechanical stability comes from having fused quartz, in ____ gravity, cold.\Question: Choose the right answer from options given a) five b) zero c) six d) two

SOLUTION: b

PROBLEM: Most people change careers ____ to seven times during the course of their life's work.\Question: Choose the right answer from options given a) seven b) five c) one d) four

SOLUTION:
d