一道SAT 填空the challenge facing public health officials is to a

一道SAT 填空the challenge facing public health officials is to an outbreak of disease and then that
the challenge facing public health officials is to-----an outbreak of disease and then ----- that school-children are immunized.
(A) foster v. 培养,促进...provide v. 提供
(B) predict v. 预言...allege v. 断言,宣称
(C) sustain v. 承受...question v. 怀疑,审问
(D) effect v. 产生,达到目的...ascertain v. 确定
(E) anticipate v. 期望...ensure v. 确保,担保
选E
为什么第一个空填期望啊.期望一个疾病的蔓延?