将诗歌移至页面底部

Question

平均能量损失

\documentclass[a5paper,11pt]{book}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{verse}
\usepackage{showframe}

\begin{document}
\newcommand{\attrib}[1]{%
\nopagebreak{\raggedleft\footnotesize\textit{#1}\par}}

\poemtitle{Fleas}
%\settowidth{\versewidth}{You can’t tell a he from a she.}
\begin{verse}%[\versewidth]
What a funny thing is a flea. \\
You can’t tell a he from a she. \\
But he can. And she can. \\
Whoopee! \\
\end{verse}
\attrib{2015}

\newpage

\poemtitle{Fleas}
%\settowidth{\versewidth}{You can’t tell a he from a she.}
\begin{altverse}%[\versewidth]
What a funny thing is a flea. \\
You can’t tell a he from a she. \\
But he can. And she can. \\
Whoopee! \\
\end{altverse}

\begin{altverse}%[\versewidth]
What a funny thing is a flea. \\
You can’t tell a he from a she. \\
But he can. And she can. \\
Whoopee! \\
\end{altverse}

\attrib{2015}

\end{document}

但我想要的是，

所有的诗歌都放在页面底部。诗歌放在左边。日期放在右边。

它是如何改变我的 MWE 中的宏的？

我只有一个问题。这是图片。诗歌中的空白。