11.   Because the island habitat has been difficult to acquire, the survival of the mainland deer is considered crucial to the recovery of white-tails.

12.   Both campaigns are well-positioned for a stretch run in contests considered crucial to the battle for control of the Senate.

13.   Advertising in Las Vegas is also considered crucial to encourage local residents and guests at other hotels to gamble, shop or dine at Caesars.

14.   All involve emotional, sometimes violent quests to secure land and a way of life many native groups consider crucial to preserving identities.

15.   Again as in a political race, appearances and interviews by the candidates are considered crucial.

16.   Bush was clearly energized after a debate performance considered crucial in the head-to-head presidential race.

17.   But a working vaccine in Nigeria is considered crucial.

18.   But myelin and similar substances are being found in an increasing number of invertebrates where, because of their small size, speed would not necessarily be considered crucial.

19.   But their endorsement is considered crucial to its success.

20.   Carriage on TCI is considered crucial to the start up of new cable channels.