这些题目涉及的是英语语法和词汇的应用，主要考察的是学生对动词不定式、名词性从句、被动语态、条件状语从句、非谓语动词以及形容词比较级等知识点的理解和运用。下面是对各个题目涉及知识点的详细解释：
1. 题目中的"__________ the most enjoyment from your valuable antiques, read as much as you can on the subject." 考察的是动词不定式作目的状语，正确答案是"C. To get"，表示为了获得最大的乐趣，你需要阅读更多相关知识。
2. "His ______________ had dropped to 0.2 by the time he graduated from university." 此题考察名词辨析，"vision"在这里指视力，正确答案是"B. vision"。
3. "Nearly half the population _____ by the sudden spread of the previous disease." 考察的是时态和主谓一致，由于疾病已经发生并影响了人口，用过去时态，且population在此处强调个体，所以用单数形式，正确答案是"B. was wiped out"。
4. "_____________ some extra-money is found, the city theatre will soon close." 考察条件状语从句，"Unless"表示除非，正确答案是"B. Unless"。
5. "The house ______________ at the corner of the street was built in 1949." 这里考察现在分词作后置定语，修饰house，表示主动关系，正确答案是"A. standing"。
6. "__he will never forget is the four words Mrs. Brauch wrote to him." 考察主语从句，引导词"What"在这里既引导主语从句，又在从句中作宾语，正确答案是"A. What"。
7. "Because of my poor English, I'm afraid I can't make myself ____________." 考察"make + 宾语 + 宾补"结构，宾补用过去分词表示被动，正确答案是"D. understood"。
8. "I had written down exactly _____ Mr. Whitson said about the animal." 考察宾语从句，"what"引导宾语从句并作said的宾语，正确答案是"D. what"。
9. "Scientists are trying to make _____________ investigation." 考察比较级，"further"在此表示更进一步的，正确答案是"A. further"。
10. "______________ go to a doctor unless you really suffer." 这是一个祈使句的否定形式，用"Don't"开头，正确答案是"C. Do not"。
11. "______________ I suggest, my husband always disagrees." 这里考察让步状语从句，"Whatever"引导让步状语从句，表示无论建议是什么，正确答案是"D. Whatever"。
12. "She stood there, ______________ for him in the rain." 考察非谓语动词，现在分词"waiting"表示伴随动作，正确答案是"C. waiting"。
13. "She stood there, ______________ for him in the rain." 题目不完整，但根据上下文，应该是她站在那里等待他，应该填非谓语动词的适当形式，可能是"C. waiting"。
这些题目覆盖了英语语法的多个方面，包括动词不定式、名词性从句、时态、被动语态、条件状语从句、祈使句、比较级、非谓语动词等。解答这些题目需要扎实的英语基础和对语法规则的熟练掌握。
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