addict|addicted

我必须承认，我完全是个巧克力控。

I must confess, I'm a total chocolate ___addict.

他后来对海洛因上瘾了。

He later became ___addicted to heroin.

我叔叔曾是个赌徒，失去了一切。

My uncle was a gambling ___addict and lost everything.