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It would help if you could prepare the materials.
It would help if you could double-check just in case.
Could you tell me how much it costs?
If you don't mind, could you double-check that?
Could you tell me when the deadline is?
Do you know who's in charge?
Do you know where the meeting is?
How about we book it in advance?
Let me check.
It's about time we ordered.
Excuse me, this isn't what I ordered.
Excuse me, this was priced differently.