Here is my Preamble:

\documentclass[openany, oneside]{book}
\usepackage{hyperref}
\usepackage{fixltx2e}
\usepackage{booktabs}
\usepackage{caption}
\usepackage{float}
\usepackage{makecell}
\usepackage{tabularx}
\usepackage{xcolor}
\usepackage{threeparttable}
\usepackage{fancyhdr}
\usepackage{graphicx}
\usepackage{setspace}
\usepackage[super]{nth}
\usepackage{url}
\usepackage{indentfirst}
\usepackage[page,titletoc,title]{appendix}
\hypersetup{
filecolor=magenta,
urlcolor=cyan, }

\newenvironment{blockquote}{%
\par%
\vskip10pt
\leftskip=2em\rightskip=2em%
\noindent\ignorespaces}{%
\par\vskip10pt}

\title{Alcohol Use in College: Results from a Survey}
\author{Crystal Thompson}
\date{Summer 2018}
\begin{document}
\renewcommand{\thepage}{\roman{page}}
\pagestyle{plain}

\maketitle
\begin{titlepage}

\vspace*{1cm}
\noindent
The Proseminar of Crystal Thompson is approved:

\vspace{0.5cm}

\vspace{1.5cm}

\begin{tabular}{lrrrrrrlrr}
&       &       &       &       &       &       &       &       &  \\
\cmidrule{1-6}\cmidrule{8-10} Jia Liu, Ph.D., Chair &       &       &
&       &       &       & Date  &     &  \\
\end{tabular}%
\end{titlepage}
\textbf{\tableofcontents}
\doublespace
\abstract
\vskip8pt

\mainmatter
\chapter{INTRODUCTION}
\end{document}


I am trying to delete that empty page that is in between the approval page and the table of contents.

• What does \usepackage{grad_proseminar} do? If it is not relevant to the issue, remove it. If it is, please provide it. And there is a \begin{document} missing and it seems that some relevant packages are not loaded. – marmot Aug 6 '18 at 23:30
• It a template for my undergraduate proseminar. – Crystal Thompson Aug 6 '18 at 23:34
• When I take out \usepackage{grad_proseminar} out of the preamble , there i an error that says that the command \advisor is undefined. – Crystal Thompson Aug 6 '18 at 23:43
• Well there is no link to it, since this temple was provide by my University. – Crystal Thompson Aug 6 '18 at 23:50
• Yes, I do agree with what you. I see that I tried to take the short cut and tried to include all the important parts about my dilemma and see that I left out a few keep components to the code. Thanks for the nice tips. – Crystal Thompson Aug 7 '18 at 0:30

Replace \textbf{\tableofcontents} by {\bfseries\tableofcontents}:

\documentclass[openany, oneside]{book}
\usepackage{hyperref}
\usepackage{fixltx2e}
\usepackage{booktabs}
\usepackage{caption}
\usepackage{float}
\usepackage{makecell}
\usepackage{tabularx}
\usepackage{xcolor}
\usepackage{threeparttable}
\usepackage{fancyhdr}
\usepackage{graphicx}
\usepackage{setspace}
\usepackage[super]{nth}
\usepackage{url}
\usepackage{indentfirst}
\usepackage[page,titletoc,title]{appendix}
\hypersetup{
filecolor=magenta,
urlcolor=cyan, }

\newenvironment{blockquote}{%
\par%
\vskip10pt
\leftskip=2em\rightskip=2em%
\noindent\ignorespaces}{%
\par\vskip10pt}

\title{Alcohol Use in College: Results from a Survey}
\author{Crystal Thompson}
\date{Summer 2018}
\begin{document}
\renewcommand{\thepage}{\roman{page}}
\pagestyle{plain}

\maketitle
\begin{titlepage}

\vspace*{1cm}
\noindent
The Proseminar of Crystal Thompson is approved:

\vspace{0.5cm}

\vspace{1.5cm}

\begin{tabular}{lrrrrrrlrr}
&       &       &       &       &       &       &       &       &  \\
\cmidrule{1-6}\cmidrule{8-10} Jia Liu, Ph.D., Chair &       &       &
&       &       &       & Date  &     &  \\
\end{tabular}%
\end{titlepage}
{\bfseries\tableofcontents}% <- changed!
\doublespace
%\abstract
\vskip8pt

\mainmatter
\chapter{INTRODUCTION}
\end{document}


Result: