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: Cleavage is perfect in ____ directions, prismatic.\Question: Choose the right answer from options given a) two b) nine c) three d) seven

SOLUTION: a

PROBLEM: Urea cycle requires the coordination of ____ different tissues.\Question: Choose the right answer from options given a) two b) four c) nine d) zero

SOLUTION: a

PROBLEM: Doctors say the average adult needs seven to ____ hours of sleep a night.\Question: Choose the right answer from options given a) nine b) five c) two d) eight

SOLUTION:
a