Length: meter
Mass: kilogram
Volume: cubic meter
meters
Kilograms
I would use meters
There is only one metric system. The relevant units, within that system would be millimetres.
Meters should be used to measure the length of a tennis court in metric units.
What metric unit would you use to measure a computer keyboard
A ruler
meters
Kilograms
Litres
It would probably be miles.
Meters
Yards if you work in imperial units or metres if you work in metric units
I would use meters
There is only one metric system. The relevant units, within that system would be millimetres.
Meters should be used to measure the length of a tennis court in metric units.
The is only one Metric System. That is the one you would use. The units you use to measure mass is the kilogram (Kg).