I'm sorry. We're not ____________ exchange them without a receipt. - supposed to, Is there _______ could possibly check? I'd be really grateful. - any way, Let me have a ______ - look, Thanks. I really _______. You've been very helpful. - appreciate it, _________, I need to print a new ticket with the same number. - strictly speaking, Is there nothing you can do? I mean, _________ double check it, please? - couldn't you, That'd be great. You'd be _________ us out. - really helping, I can't _______ enough. - thank you, I'd like to get a ______. - refund,

B1+ Language in action. Fill in the gap.

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