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I'd like you to help me with the following sentence:
Call me_____________ there's an emergency.
a. in the case
b. provided
The teacher's book gives (a) as the correct answer. Is (a) possible?? provided does not seem appropriate to me.However, i thought there is no such expression like in the case .I've seen it only followed by of (e.g.in the case of emergency). Then i thought that it may be a printer's error.Now i'm confused!
in case vs provided 
!!!!
with the following sentence:
Then i thought that it may be a printer's error.Now i'm confused!
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