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+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Fill-in-the-blank macros
+% Hal Varian
+% August 19, 1987
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+
+%list processing routines taken from TeXbook, p. 310-11
+
+\def\dolist{\afterassignment\dodolist\let\next= }
+\def\dodolist{\ifx\next\endlist \let\next\relax
+ \else \\\let\next\dolist \fi
+ \next}
+\def\endlist{\endlist}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%print out answers or not?
+\newif\ifDoAnswers\DoAnswerstrue
+
+%See if next token is a space. If it is, set a low penalty for
+%line breaking. Set box 0 to be the next token. If we should
+%do answers, underscore box 0, back up and print box 0. Otherwise
+%just underscore box 0.
+\def\\{\expandafter\if\space\next\penalty0\fi\setbox0=\hbox{\next}\ifDoAnswers
+ \underscore\llap{\raise2pt\box0}\else\underscore\fi}
+
+%Underscore -- put in strut so there is enough space for handwriting.
+\def\underscore{\bigstrut\vrule height 0pt depth.5pt width\wd0}
+\def\bigstrut{\hbox{\vrule height 16pt width 0pt}}
+
+\def\Ans#1{\space{\AnsFont {\dolist#1\endlist}\underscore}}
+
+%%% ----cutting here would not be a bad idea-----------------------