mile - kilometre, gallon - ?

LITRE
List of words for the clue mile - kilometre, gallon - ? from the crossword:
UNIT ACRE INCH POUND KILOGRAM MARATHON KM KLICK KILOMETER HECTARE CENTEMETRE PINTS PINT PER QUART MI RATE TUNS STETSON
WordClue
ACREkilometre - mile, hectare - ?
INCHkilometre - mile, centemetre - ?
MILElitre - gallon, kilometre - ?
UNITinch or mile
YARDlitre - gallon, metre - ?
CURIEnon-SI unit of radioactivity
FARADunit of capacitance
HERTZSI unit for frequency
METREgallon - litre, yard - ?
MONTHunit of time dividing the year
OUNCEunit of mass
PENNYunit of currency in various countries
POUNDkilometre - mile, kilogram - ?
QUARTunit of volume
GALLONkilometre - mile, litre - ?
HECTAREmile - kilometre, acre - ?
KILOGRAMmile - kilometre, pound - ?
MARATHON42.195 kilometre road race
KILOMETREgallon - litre, mile - ?
CENTEMETREmile - kilometre, inch - ?
HECTAREmile - kilometre, acre - ?
CENTEMETREmile - kilometre, inch - ?