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: Carbon can bond to a maximum of ____ atoms.\Question: Choose the right answer from options given a) six b) ten c) five d) four

SOLUTION: d

PROBLEM: Cyclic neutropenia tends to occur every three weeks and last ____ to six days at a time.\Question: Choose the right answer from options given a) six b) four c) five d) three

SOLUTION: d

PROBLEM: White sturgeon inhabit ____ large river systems, all on the western coast of North America.\Question: Choose the right answer from options given a) six b) ten c) three d) eight

SOLUTION:
c