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: Chlorine has ____ naturally occurring isotopes.\Question: Choose the right answer from options given a) nine b) eight c) three d) two

SOLUTION: d

PROBLEM: Lions have ____ distinct vocalizations including roars, grunts and growls.\Question: Choose the right answer from options given a) eight b) six c) four d) nine

SOLUTION: d

PROBLEM: Lazy eye develops rapidly during the first ____ years of life.\Question: Choose the right answer from options given a) three b) zero c) seven d) no

SOLUTION:
a