他后来对海洛因上瘾了。

He later became ___addicted to heroin.

有一天，我叔叔打电话告诉我一个对毒品上瘾的男孩的故事。

One day my uncle called and told me a story of a boy who was ___addicted to drugs.

许多人对尼古丁上瘾。

Many people become ___addicted to nicotine.