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: Avian kidneys have ____ kinds of nephrons.\Question: Choose the right answer from options given a) four b) eight c) no d) two

SOLUTION: d

PROBLEM: National forests have regulations that restrict ____ wheeler use to established roads.\Question: Choose the right answer from options given a) no b) four c) six d) nine

SOLUTION: b

PROBLEM: Children spend an average of ____ years in a single parent household.\Question: Choose the right answer from options given a) nine b) eight c) three d) five

SOLUTION:
d