I would have chosen opposite to what you chose; however, I am American, and we don't use the word certain in America as much as they do in the UK. I'd say, though, that all of the following are possible: be sure, make sure, make certain. e.
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DominikWhich is correct?There is no "correct"; they both mean the same thing. Choose as you wish. It's just that 'certain' is a word with a little more class.