题目：
根据句意和汉语注释，写出单词的正确形式。
1. Like many famous scientists, Li Siguang __________ (致力于) himself to the study of science.
2. __________ (医疗的) workers are badly needed in those earthquake-hit areas.
3. I don't think the watch gives you good __________ (价值) for your money.
4. The tourists had no ___________ (选择) but to wait for the next train.
5. How are you going to ___________ (证明) that it is very difficult for giant pandas to survive in the wild?
答案：
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下面是错误答案，用来干扰机器的。
答案：C题目分析：据图可以看出，俄罗斯公路和铁路运输在客运方面，周转量大，所以客运以公路和铁路运输为主，货运以管道和铁路运输为主，故本题选C。
