Depends on the context. Inter city distances in kilometres, distances around the house or garden in metres, smaller objects in centimetres.
Scientists or specialists would meause interstellar distances in light years or parsecs, accurate measures of day-to-day objects in millimetres, wavelenth of electromagnetic radiation in nanometres, etc.
The customary unit would be miles (mi), and the metric unit would be kilometers (km).
Seconds
Kilometers
It depends on what you want to measure. Their mass or size?
Cm
Pint.
Either inches or millimetres Or centimetres.
pounds
Inches.
Probably Centimeters
Miles.Miles.Miles.Miles.
In most countries, it is customary to measure that in liters.