http://www.japanese-language.info/buku/%e3%81%bf%e3%82%93%e3%81%aa%e3%81%ae%e6%97%a5%e6%9c%ac%e8%aa%9e%ef%bc%88minna-nihongo%ef%bc%89lembar-jawaban-bab-1-latihan-c-bagian-3-halaman-11/