1.Over a third of the population was estimated _________( 没有机会享受医疗保健服务)

to have no access to the health service
【解析】本题考查对不定式和have(no)access to的掌握。空格处在句中作主语补足语，不定式变成被动语态以后，都必须加上to have(no)access to意为“(没)有接近(或进入、享用)的机会”。

2.Surrounded by the police, the kidnappers___________( 没有选择，只能当场投降）

had no choice but to surrender on the spot
【解析】本题考查对have no choice but to do及短语on the spot的掌握。have no choice but to do意为“除…之外别无选择”，注意不要忽略to。on the spot意为“当场”。本句时态应为一般过去时，故用had。

3.The customer complained that___________(他刚启动这台计算机) than it stopped working.

no sooner had he started the computer．
【解析】本题考查对no sooner…than句型的掌握。no Sooner…than和hardly(scarcely)…when都表示“刚…?就…”，注意其中连词的区别。该句型有两个特点：一是主句中一般使用过去完成时，而从句中一般使用一般过去时；二是no sooner或hardly(scarcely)位于句首时，要求句子采用部分倒装语序。本句中no sooner位于句首，故句子采用了倒装语序。

4.The father thought he could ______________(说服女儿改变决定)

talk his daughter into changing her mind/persuade his daughter to change her mind
【解析】本题考查对短语talk sb．into doing sth．或persuade sb．to do sth掌握。两者都表示“说服某人做某事”，但要注意talk sb．into后接动名词，persuade sb．后接不定式。

5.The government was accused____________ (没能实现其改善城市交通状况的承诺)

of failure to fulfill its promise to improve urban traffic conditions/of failing to fulfill its promise to improve urban traffic conditions ．
【解析】本题考查对accuse的用法及短语fulfill one’s promise to…的掌握。accuse“指责、控告”常用于accuse sb．of sth．/doing sth．结构，所以was accused of之后用failure和failing都可以。“实现…的承诺”用fulfill one’s promise to表示，to后接动词原形。