How can I copy and paste multiple texts?
Check this: http://jumpcut.sourceforge.net/

Cited from the above:


  Jumpcut is an application that provides "clipboard buffering" — that
  is, access to text that you've cut or copied, even if you've
  subsequently cut or copied something else. The goal of Jumpcut's
  interface is to provide quick, natural, intuitive access to your
  clipboard's history.