\startuseMPgraphic{mark}
path p;
p := unitsquare scaled 3cm;
draw p;
draw (point 0 of p)--(point 2 of p);
draw (point 1 of p)--(point 3 of p);
\stopuseMPgraphic
\startuseMPgraphic{verticalrule3}
draw rightboundary OverlayBox shifted (1mm,0); %if CurrentColumn = 1: shifted(-2mm,0) fi ;
draw leftboundary OverlayBox shifted (-1mm,0); %if CurrentColumn = 2: shifted(2mm,0) fi ;
draw bottomboundary OverlayBox leftenlarged 1mm rightenlarged 1mm;
draw topboundary OverlayBox leftenlarged 1mm rightenlarged 1mm;
\stopuseMPgraphic
\defineoverlay
[verticalrule]
[\useMPgraphic{verticalrule3}]
\setuppagenumbering[state=stop]
\setupexternalfigures[location={local,defalut}]
\definecolumnset
[quiz]
[n=2,background=verticalrule]
\setupbodyfont[bonum, rm, 11pt]
\starttext
%\startcolumns[n=2,background=verticalrule]
\startcolumnset[quiz]
\startitemize[n]
\item Solve the following linear equations.
\startitemize[r]
\item equation
% \blank[3.5cm]
\vfill
\item equation
% \blank[3.5cm]
\vfill
\item equation
\blank[3.5cm]
\item equation
\blank[3.5cm]
\item equation
\blank[3.5cm]
\stopitemize
\hrule
\column
\item Draw the graph of the following linear function.
\startitemize[r]
\item $2x +3y = 6$
\startplacefigure[location={here,none},]
\useMPgraphic{mark}
\stopplacefigure
\item $y = 2x - 1$
\startplacefigure[location={here,none}]
\useMPgraphic{mark}
\stopplacefigure
\stopitemize
\item Find the formula of the line 1:
\vfill
\item Find the formula of the line 2:
\vfill
\stopitemize
\stopcolumnset
\stoptext
%%%%%%%%%%