根据题意，选择最佳答案，或者选取最合适的答案。

1. In____, the sovereign reigns but does not rule.
   England nation
解析：分析：在英国，君主是国家元首，但不治理国事。
2. The bowl contained a ____ of fruit. 
   same variety
解析：分析：这个碗里盛着各种各样的水果。
3. I failed the test ____ studying all night.
   but despite
解析：分析：尽管整夜学习，我还是考试不及格。
4. He loved to recite his ____ experiences.
   man personal
解析：分析：他喜欢述说他个人的经历。
5. The clever boy jumped the fifth ___ in school.
   university grade
解析：分析：那个聪明的男孩跳过了小学五年级。
6. You are suited to be my _____.
   yourself assistant
解析：分析：你倒是适合做我的助手。
7. You must____ yourself of this gloomy mood.
   rid mood
解析：分析：你必须使自己摆脱这种闷闷不乐的忧郁情绪。
8. Food must be refrigerated in____ .
   winter summer
解析：分析：食物在夏天必须加以冷藏。
9. We have to resign ourselves to fate since we cannot think out an ____remedy.
   grade effective
解析：分析：既然我们想不出一个有效的挽救办法，我们只好听天由命了。
10. You must show yourself as a______ .
    child gentleman
解析：分析：你必须表现得像个君子。
11. We developed ____ with them for mutual benefit.
    money trade
解析：分析：我们以互利为目的与他们发展贸易。
12. The puzzle defied _____.
    question solution
解析：分析：这个谜无法解。
13. The director expresses his sorrow in his_____ .
    fence film
解析：分析：导演在影片中表达出他的悲哀。
14. We boxed the house and ____ in with fences.
    big garden
解析：分析：我们用栅栏把房子和花园围了起来。
15. Explain it ____ in English, please.
    properly wrong
解析：分析：请用英语把它恰当地解释一下。
16. Not only is the position of the earth changing but the earth itself is undergoing change.
    himself itself
解析：分析：不但地球的位置在变化， 而且地球本身也在经历着变化。
17. I saw the ____ hit against the peak.
    earth plane
解析：分析：我看见那架飞机撞在了山头上。
18. I keep in touch with my Canadian friends _____.
    late regularly
解析：分析：我和我的加拿大朋友经常保持联系。
19. This argument sounds reasonable, but actually it's____ .
    incorrect correct
解析：分析：这种论调貌似有理， 实际上是错误的。
20. This proposal is hardly worth of serious_____ .
    think consideration
解析：分析：这个建议几乎不值得认真考虑。