80-On August 26, he returned to his laboratory and the following day began his ----------- on his electric light bulb. 1) generations 2) experiments 3) combinations 4) inventions
\textbf{80-} \textbf{On August 26, he returned to his laboratory and the following day began his ----------- on his electric light bulb.}
\noindent 1) generations \quad 2) experiments \quad 3) combinations \quad 4) inventions
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