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We arrived in St.Petersburg at five o' clock

We arrived in St.Petersburg at five o' clock1 Did we arrive in St.Petersburg at five o' clock?2 Did we arrive in St.Petersburg at five  or at six o' clock?3 Who arrived in St.Petersburg at five o' clock?4 We arrived in St.Petersburg at five o' clock, didn't we?5 What time did we arrive in St.Petersburg?