如何在Rmarkdown（pagedown）中删除空白页

这是我的代码：

---
title: "A Multi-page HTML Document"
author: "Yihui Xie and Romain Lesur"
date: "`r Sys.Date()`"
output:
  pagedown::html_paged:
    toc: true
    toc_depth: 3
    # change to true for a self-contained document, but it'll be a litte slower for Pandoc to render
    self_contained: false
---

# Exercises 1 {-}

# Exercises 2 {-}

# Exercises 3 {-}

如何修复这些空白页？那我想删除。