根据题意，选择最佳答案，或者选取最合适的答案。

1. Mary devoted as much time as she could _________for the elderly.
   care to caring
解析： 句意：玛丽投入尽可能多的时间来照顾老人。devote time to doing sth“投入时间做某事”，故此处用to+caring,故选B。
2. My mother says that we won't go on a trip to Hong Kong. I just can't understand--- ____. You were looking forward to it.
   No problem What a pity
解析：解析：A. No problem 没问题B 根据句意，不能去香港旅行，感到很遗憾。故选B. What a pity太遗憾了
3. China is larger than ________in Asia.
   any country any other country
解析：句意：中国比亚洲其他任何一个国家都大。因为是两者比较，而且最终范围是Asia，china在Asia范围内，所以是和其他的国家比，选B
4. Our country_ a lot in the last few years.
   changes has changed
解析：试题分析：根据时间状语in the last few years可知该用现在完成时，所以选B
5. I have three sisters. They are all ___.
   woman teacher women teachers
解析：试题分析：句意：我有三个姐姐。她们都是女教师。名词woman做定语，要与所修饰名词保持单复数一致。据题意，故选B。
6. What impressed me most was that they never ________.
   lost hearts lost heart
解析：试题分析：考查固定短语。句意：最让我印象深刻的是他们从不灰心丧气。lose heart灰心，心灰意冷，是固定短语，中间不加形容词性物主代词，故选B
7. In Britain today women _______ 44% of the workplace, and nearly half the mothers with children are in paid work.
   pick up send up
解析：解析：如今在英国44%的妇女走进了工作岗位，其中一般的女性带着孩子工作。
8. The single invention of the computer _______many new professions.
   gave a birth to gave birth to
解析：试题分析：考查固定搭配。固定搭配give birth to生育，生；引起；产生；句意：计算机的发明产生了很多新的职业。故B正确
9. We all know travel can ＿＿＿ our knowledge of the world.
   discover increase
解析：试题分析：句意：我们都知道旅游能增加我们的世界的了解。A. discover发现， B. increase增加。据句意，故选B
10. As the world’s population continues to grow, the ______ of food becomes more and more of a concern.
    worth supply
解析：试题分析：考查名词词义辨析。A.价值；B.供应；句意：随着世界人口继续地增加，食物供应问题变得越来越受关注。故选B
11. Nanjing isn’t so large____ Shanghai. But it's the second____ city in East China.
    like; largest as; largest
解析：试题分析：句意：南京不如上海大。但是，它是中国东部第二大城市。分析：考查固定短语:not as…as不如；中间接形容词或副词原形；下文提到南京是中国东部第二大城市，因此用最高级形式。故选B
12. Shall we go camping tomorrow? ------ It is _______ him to decide.
    similar to up to
解析：试题分析: 句意：---明天我们去野营吗？---这得由他决定。A与……相似；B由……决定；根据句意，故选B
13. My mother______when I got home.
    cook was cooking
解析：试题分析：when 引导的时间状语从句，主句用过去进行时，从句用一般过去式。句意：放我到家的时候，母亲正在做饭。结合句意，故选B
14. What would you like to _________ if you were in a university? -- Science
    major in join in
解析：解析：上大学后，你会学习哪个专业？科学A项 专业；B项 加入
15. The ______ of new technology is to make life easier, not to make it more difficult.
    trouble purpose
解析：试题分析：句意：新科技的目的是使生活更简单，而不是更困难。A. trouble麻烦； B. purpose目的；结合句意，故选B
16. ____ at the city centre, the old temple has a history of more than 500 years.
    Locating Located
解析：试题分析：句意，这座古庙位于市中心，有五百多年的历史。Locate，用被动语态，意思是使坐落于，位于，故选B
17. I’m not sure ,but he’s supposed ______ sometime next week.
    Return to return
解析：试题分析：句意：我不确定，但是他应该在下周的某个时间回来。be supposed to do sth,应该做某事。结合选项，故选B
18. Why did the teacher the boy? --Because he helped an old man.
    punish Praise
解析：试题分析：句意:----老师为什么赞扬了这个男孩？--因为他帮助了一位老人。A、punish 惩罚； B、praise 赞扬；从答语中可以看出老师赞扬小孩的助人为乐行为，故选B
19. He was ___in the car accident.
    damaged injured
解析：试题分析：考查词义辨析。Winjure表示在事故里所受的伤害，Damage表示的是可以修复的破坏。本句表示的是在事故中所受的伤害，故B正确
20. More and more animals are—— around the world. We should try to protect them.
    in need in danger
解析：试题分析：句意:世界上越来越多的动物处在危险中，我们应该尽力保护他们。in need 处在需要中；in danger 处在危险中。根据句意可知，很多动物处在危险中，所以我们要尽力保护他们。故选B