gallon - litre, pound - ?

KILOGRAM
List of words for the clue gallon - litre, pound - ? from the crossword:
UNIT PETROL EZRA YARD MILE METRE LITER KILOMETRE INCH RETAIL MAGNUM L CENTEMETRE ACRE PINTS PINT QUID QUART OUNCE
WordClue
ACRElitre - gallon, hectare - ?
INCHlitre - gallon, centemetre - ?
MASSsecond - time, kilogram - ?
MILElitre - gallon, kilometre - ?
PUMPof petrol or heat
TIMEkilogram - mass, second - ?
UNITcarat or gallon
YARDlitre - gallon, metre - ?
LITREpound - kilogram, gallon - ?
METERmass - kilogram, distance - ?
METREgallon - litre, yard - ?
POUNDlitre - gallon, kilogram - ?
ENGINEturbojet or petrol
GALLONkilogram - pound, litre - ?
SECONDmass - kilogram, time - ?
HECTAREpound - kilogram, acre - ?
DISTANCEkilogram - mass, meter - ?
STERLINGpound
KILOMETREgallon - litre, mile - ?
CENTEMETREgallon - litre, inch - ?
KILOMETREgallon - litre, mile - ?
METREgallon - litre, yard - ?