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').

[Q]: Ozone is a molecule containing ____ oxygen atoms.\Question: Choose the right answer from options given a) one b) nine c) no d) three
[A]: d


[Q]: Most children have a vocabulary of eight to ____ words, including names, by eighteen months of age.\Question: Choose the right answer from options given a) ten b) one c) seven d) eight
[A]: a


[Q]: Paramecia have ____ nuclei, a macronucleus and a micronucleus.\Question: Choose the right answer from options given a) eight b) nine c) two d) one
[A]:
c