Fully, totally, completely or wholly?

[^^vangiang^^]

Help me to distinguish between these words in a sentence
"When you read something in a foreign language , you frequently come across words you do not _____ understand" .

Thanks a lot in advance !

[JKidd]

I'd say "completely." I think the others are slang terms, but I'm not really sure.

[Milanya]

The words fully, totally, completely or wholly, utterly, entirely, thoroughly (and some others) are listed as synonyms in my thesaurus. I believe that any of them fits into your sentence. None of these words is a slang term.
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con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.

[^^vangiang^^]

yarr, at first i also think so ... but in fact , it's "fully" which is the answer in my book
hmm... i am still confused about it .
however , thanks for help