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: Most infected persons have ____ symptoms of disease.\Question: Choose the right answer from options given a) six b) no c) three d) one

SOLUTION: b

PROBLEM: Tetrapods are animals that have ____ legs or leg-like appendages.\Question: Choose the right answer from options given a) four b) one c) ten d) six

SOLUTION: a

PROBLEM: Plants grow up to ____ feet tall and spread to about three feet.\Question: Choose the right answer from options given a) three b) seven c) one d) no

SOLUTION:
a

