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: Foresters usually work ____ hours a day, five days a week.\Question: Choose the right answer from options given a) six b) five c) seven d) eight

SOLUTION: d

PROBLEM: Solid lines are the sight-lines to the ____ background QSOs.\Question: Choose the right answer from options given a) three b) four c) ten d) five

SOLUTION:
a