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: Voles are prolific breeders and can produce four to ____ litters a year.\Question: Choose the right answer from options given a) four b) two c) six d) three

SOLUTION: c

PROBLEM: Hummingbirds feed every ____ to fifteen minutes from sun-up to sundown.\Question: Choose the right answer from options given a) nine b) seven c) four d) ten

SOLUTION: d

PROBLEM: Snakes shed from ____ to three times a year.\Question: Choose the right answer from options given a) two b) three c) one d) four

SOLUTION:
c