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It's said they'd be right over, and they're still not here.
Could you save a seat in advance?
It's supposedly notified, and they're still not here.
Could you prepare the materials in advance?
It's the agreed time, and they're still not here.
Could you make a booking in advance?
It's half an hour late, and they're still not here.
Could you let him know in advance?
It's already past the time, and they're still not here.
Could you look up the route in advance?
It might be nice to take a photo to remember it.
Could you gather what we need in advance?