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: 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: Many comets have ____ tails.\Question: Choose the right answer from options given a) two b) six c) three d) one

SOLUTION: a

PROBLEM: Infant communities are very special environments for toddlers aged approximately ____ to three years.\Question: Choose the right answer from options given a) one b) ten c) no d) seven

SOLUTION:
a