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: Hamsters can live to be three to ____ years old.\Question: Choose the right answer from options given a) four b) two c) three d) nine

SOLUTION: a

PROBLEM: Drug resistance is important for ____ reasons.\Question: Choose the right answer from options given a) ten b) two c) four d) five

SOLUTION:
b