60%=3÷5=2135=4：10=0.6；
故答案为：60，35，4，0.6．
补全下列反意疑问句。
1. They often watch TV, ______?
2. She doesn't have any brothers, ______?
3. Jenny has bought a new hat, ______?
4. My brother finished his homework, ______?
5. We aren't having an English class now, ______?
税收结构的变化经历了（）、（）、（）三个历史阶段。
