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').

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

[EX Q]: Sexual reproduction involves ____ parents, one male and one female.\Question: Choose the right answer from options given a) zero b) two c) nine d) four
[EX A]: b

[EX Q]: Free trade means ____ barriers to imports or exports between nations.\Question: Choose the right answer from options given a) no b) six c) ten d) four
[EX A]:
a