It doesn’t matter ________ you pay by cash or credit card in this store.(2012·山东，25)

I recognized you I saw you _____ at the airport though we hadn’t seen each other for many years. [ ]

Lin Hai and Dave __ his good friends.

His knowledge of French was ________ for the job, although he was not fluent in the language. [ ]

My brother wants to be a policeman. He thinks it’s a little dangerous ______exciting.