患者女性，55岁。主诉外阴瘙痒、烧灼感，白带增多。妇科检查： * * 老年性改变，黏膜充血，淡黄色稀薄分泌物。为该患者行 * * 冲洗首选液体为（）

A.4%乳酸溶液

B.0.5%醋酸溶液

C.5%碳酸氢钠

D.1：5000高锰酸钾

E.生理盐水

根据下列句子的意思及所给的汉语提示，写出空缺处的词。

1. Because of his ________ (死), his parents were badly ill.

2. This is the ________ (九十九) stamp.

3. I'm sure you can pass the exam ________ (成功).

4. Look! The sick man is very tired, but he is still _________ (练习走) without any help.

5. By the time I arrived there, the film had _________ (开始) for about five minutes.