82-We had trouble doing the experiment; it is really a very ------------- one. 1) anxious 2) mental 3) concerned 4) complicated
\textbf{82-} \textbf{We had trouble doing the experiment; it is really a very ------------- one.}\\
1) anxious \hspace{1cm} 2) mental \hspace{1cm} 3) concerned \hspace{1cm} 4) complicated
\noindent