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: Anthrax usually is a fatal disease with ____ symptoms observed.\Question: Choose the right answer from options given a) no b) seven c) one d) six

SOLUTION: a

PROBLEM: Capital letters account for only ____ percent of all letters in written English.\Question: Choose the right answer from options given a) no b) six c) one d) five

SOLUTION:
d