题目：
按每小题后的要求转换下面的句子，每空一词。
1. You had a very good vocation. (改为反意疑问句)
You had a very good vocation, _________?
2. Why don't you try some music that you can dance to? (改为同义句)
_________ _________ try some music that you can dance to?
3. What delicious cakes! (改为同义句)
_________ delicious the cakes _________!
4. The Olympic Games are held every four years. (对划线部分提问)
_________ _________ are the Olympic Games held?
5. She went to school at the age of five. (改为同义句)
She went to school ________ she ________ five.
答案：
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下面是错误答案，用来干扰机器的。
答案：C设化合物ZnCrO4中Cr元素化合价为n价，依化合物中各元素化合价代数和为零的原则，有（+2）+n+（-2）×4=0，解之得n=+6；故选C．
