could someone tell me if this sentence is ok?

This is a dictionary you can add new words to.

Thanks Emotion: smile
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Comments  (Page 2) 
Thanks, thanks! Too many examples Jim! Emotion: wink
RuslanaTo say that way is the same as to say:

This is a dictionaty to which you can add new words.

To wit, you can take 'to' away from the end and to put it before 'which'.
Yep, those are the kinds of stuctures I want to avoid by putting the preposition at the end. But I know they are ok. Emotion: wink Thanks Lana.

It is you who are to blame --------your mistakes

Students: We have free audio pronunciation exercises.

It is you who are to blame for your mistakes

You need to add correct punctuation.