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исчезать, исчезнуть - to dissapear

Он взял деньги и исчез.
He grabbed the money and dissappeared.

Here is another word that is giving me much troubles.

принадлежАть - to belong to, to be a member of
Examples:
принадлежать по праву — belong by right, belong rightfully
принадлежать к партии...

Thanks Guin :)
Here is another word that was giving me troubles.
I often confuse it with обстановка.

остановка - station, stop (as in bus stop)
Examples:
конечная остановка — terminal ...

Thank you all for your help. I think I got обстановка permanently burned into my brain. :)

Here are a couple of other words that I often get confused.

страх - fear, fright (masc)
Examples:...

The following word does not stick well in my head.
Maybe if I post it here, I will remeber it.

обстановка - furniture; situation

Examples:
международная обстановка — international situation ...

Here are a couple of more words.
I always get them confused so maybe others are having the same problem.

слышать/услышать
Meaning: (verb) to hear
Example: он слышал плач ребёнка — he heard a...

This word seems to be giving me a lot of trouble.

Word: поступАть(imp)/поступИть(per)
Meaning: (verb) to act
Pronunciation: postupAt/postupEEt
Example: ему не следовало так поступать...