21.   The state is struggling to meet federal standards for still cleaner cars by early in the next century.

22.   They require the automakers to phase in four types of cleaner cars over the next several years.

23.   Was it a cleaner car engine?

24.   With a compromise, it could win cleaner cars from Miami to Houston to Denver than would otherwise be the case.

25.   Major automakers producing cleaner car.

26.   The accord is part of a series of measures, also tentatively approved by the environment ministers, to force Europeans to buy cleaner cars in the years ahead.

27.   THE government was slammed Thursday for taking a year to test a cleaner car fuel that had already been proven effective in other countries.