1. She could have passed the exam if she_________.
2. Many countries with long history in the world are now________.
3. The manager ensured us that is wont be long___________.
4. ________________, the book tells us how to predict them.
5.The more volunteers visit there, ___________________.
1.答案: has been in good health
详解:
考查对过去情况的虚拟：主句用could have done,从句应用had done 结构。
考查固定表达： 身体好 的固定用法为be in good health
2.答案: falling behind the western developed nations/countries
详解:
考查固定短语: 落后 的表达为fall behind，句中now提示需用进行时falling behind。
查核心词汇: 发达的developed，发达国家 developed nations/countries.
3. 答案: before we get pay rise//before he raises our salary/pay
详解:
考查before引导的时间状语从句: it wont be long 表示 不久... 。
考查名词短语: 加薪 可表示为pay rise, 词句中如果以 我们 作主语，就用get pay rise;
如果以the manager 做主语，用before he raises our salary/pay.
4.答案: In addtion to the knowledge about natural disasters.
详解:
考查固定短语in addtion to: 这句话强调这本书的两大内容，用in addtion to表示 除...之
外 , 还有... ，也可用besides.
考查对 ...的知识 的表达: knowledge about.
名词短语 自然灾害 的表达: natural disasters.
5.答案: the better it will be for children in poor areas.
详解:
考查介词短语: 考查the+比较级的结构，表示 越...越.... , 前半句比较级后为一个完整的句子，为保持平衡，后半句比较级后也应是一个句子。
考查指示代词it: it在句中作主语，指代上文提到的 越多志愿者去那里
考查名词短语: 贫困地区的孩子 可用children is poor areas表示。