`\hrulefill` 上的考试类别溢出的水平盒子

Question

我正在使用考试课程，由于某种原因，我在文档中提供的以下示例中pdflatex遇到了溢出错误：hbox

\documentclass[10pt,letterpaper,final]{exam}

% AMS Packages

\usepackage{amsmath}

% TiKZ Packages

\usepackage{pgf}
\usepackage{tikz}
\usetikzlibrary{arrows,automata,positioning}

% Font Settings

\usepackage{MinionPro}
\usepackage{MyriadPro}
\usepackage[scaled]{beramono}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage[protrusion,expansion,final,babel]{microtype}

% Headers and Footers

\pagestyle{headandfoot}
\runningheadrule
\firstpageheadrule
\firstpageheader{CSCI 3660}{Exam 2}{Fall 2019}
\runningheader{CSCI 3660}{Exam 2, Page \thepage\ of \numpages}{Fall 2019}
\firstpagefooter{}{}{}
\runningfooter{}{}{}

\begin{document}

\begin{center}
  \fbox{\fbox{\parbox{5.5in}{\centering Answer all of the questions below. The
        organization and neatness of your answers, as well as the legibility of
        your writing will count for $10\%$ of your grade.}}}
\end{center}

\vspace{5mm}

\makebox[\textwidth]{Name and section:\enspace\hrulefill}

\vspace{5mm}

\makebox[\textwidth]{Instructor’s name:\enspace\hrulefill}


\begin{questions}

  \question foo

\end{questions}

\end{document}

具体来说，问题出在hrulefill问题环境之前的两个命令上。有人知道如何解决这个问题吗？