1. mort/mor-death

mortgage-a conveyance of an interest in property as security for the repaymentof 

money borrowed.

mortician-funeral director.

morguea-place in which bodies are kept, especially the bodies of victims of

violence or accidents, pending identification or burial.

2.fritter-to squander or disperse piecemeal; waste little by little (usually followed by away)

  fritter something away=fritter away...

3.inadvertent-without intending to do something.

  advertent-attentive; heedful

4.

5. video

How to learn any language in six months | Chris Lonsdale | TEDxLingnanUniversity

https://www.youtube.com/watch?v=d0yGdNEWdn0