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: Casinos have no windows and they have ____ clocks.\Question: Choose the right answer from options given a) six b) four c) eight d) no

SOLUTION: d

PROBLEM: Most children improve in three to ____ days.\Question: Choose the right answer from options given a) seven b) six c) four d) ten

SOLUTION: a

PROBLEM: Females reach sexual maturity around four to ____ year-olds.\Question: Choose the right answer from options given a) ten b) five c) two d) six

SOLUTION:
b