A.obligation | B.observatory | C.oraganization | D.Laboratory |
A.thought | B.idea | C.occupation | D.Opinion |
A.paper | B.a piece of paper | C.a paper | D.a sheet of paper |
A.persons | B.paragraphs | C.articles | D.Units |
A.audiences | B.visitors | C.travelers | D.Passersby |
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