21.   Could all this be used to keep out unions?

22.   DeBakey hopes the VAD eventually can be used to keep people alive while their hearts recover.

23.   Dehydrated spices are used to keep the mix from becoming too wet, and brown sugar is added as a food coloring and sweetener.

24.   Encryption is widely used to keep computer data and online communications like e-mail private.

25.   Foreign sales are often used to keep open production lines of weapons that the Pentagon needs only in small numbers.

26.   He landed awkwardly across an automobile tire used to keep the landing-pad cover from blowing away.

27.   His concern is advising golfers how to limit their exposure to some of the chemicals used to keep greens green.

28.   His filtered-air techniques are used to keep operating rooms and tissue-culture laboratories sterile.

29.   If colleges can use juvenile records to keep from admitting certain applicants, they ask, will personnel directors be the next to demand access?

30.   If you use wood skewers, soak them in water for about an hour before using to keep them from burning while on the grill.