For me that means "In my books those expressions are slang.", because that response can only refer to "It's just colloquial to me.", and not "I don't believe these expressions are slang, are they?", or that response means "Those expression are not in my books.".
So, are you saying, dihen, that the idioms in question are colloquial? They're certainly not colloquial in my books, nor are they slang.
My two bits (as a relatively experienced teacher of TOEFL):
Idioms ("face the music" et al.) and phrasal verbs are considered too informal for the writing tasks. You may not lose marks but you will certainly score higher if you don't use idioms and phrasal verbs
My two bits (as a relatively experienced teacher of TOEFL):
Idioms ("face the music" et al.) and phrasal verbs are considered too informal for the writing tasks. You may not lose marks but you will certainly score higher if you don't use idioms and phrasal verbs
Re: Can we use slang in english test? 
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