31.   Families with two cars are using the one that uses less fuel whenever possible.

32.   Finally, Xchange seeks to measure the effectiveness of those marketing campaigns to determine which ones might be used again.

33.   First, experts say, be sure to use clean ones.

34.   For safety reasons, two hoses were uncoiled in the tower though only one was used.

35.   Flagstones, too, were strewn around under the growth, and the Kneales used every one for new walkways.

36.   Forming a new Usenet group is a laborious process, so the group uses one that already existed when the civil trial began.

37.   He also fashioned various weapons in his cell and used one to stab a guard.

38.   Guess which one will be used Sunday.

39.   He has even made screws himself, though he mostly uses commercial ones.

40.   He still refuses to use a wheelchair in the Senate, though he sometimes uses one privately.