Kilometres.
This question is misguided. Centimetre is a metric unit.
The metric unit is a millilitre. The metric unit is a millilitre. The metric unit is a millilitre. The metric unit is a millilitre.
grams
The newton. (The kilogram is not a unit of weight or force.)
Meters
cm
It is a metre.
Metres.
centimetre.
gRAMS
grams
I not a metric unit of anything! A litre is one metric unit for volume.