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It would help if you could prepare the materials.
Could you tell me how much it costs?
It would help if you could check with him.
Could you tell me when the deadline is?
Do you know who's in charge?
If you don't mind, could you double-check that?
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.