Theteamplayedhardbecausethechampionshipofthestatewas______.

About 20 of the passengers who were injured in a plane crash are said to be in_____condition ．

In 1991，while t11e economies of industrialized countries met an economic_____，the economies of developing countries were growing very fast ．

设数列 {an} 的前 n 项和为 Sn，则 {an} 等差。

(1) S n4=n 2+2n, n=1,2,3

(2) S n4=n 2+ 2n +1,n=1,2,3

Weaimtoensurethatallcandidatesaretreatedfairlyandthattheyhaveequal______toemploymentopportunities．