根据句意及首字母提示完成单词

① Paper can be r____. We'd better not throw it away.

② It is important to try to save e____.

③If we don't protect our e____, the earth will be destroyed.

④ Our teacher tells us to collect r____ plastic bags.

⑤ Gold, silver and iron are all m____.

人体的各个感觉是靠分布在身体不同部位的____获得的，有的带有附属结构，通常称它们为____，如眼耳鼻舌．