I had a hard time trying this. I have known that I should bite my tounge when I pronounce "th". This sometimes goes well with words like "thick". However, every time I try to say "those", Siri will recognise my "th" as "v", which is a bit frustrating.

This is my voice:
<https://clyp.it/hfg0ujqo>
It is almost like "fick"!