改写句子按括号中的要求完成改写后的句子．每个空格填一个单词。
1. I can finish my homework before nine. (改为一般疑问句)
_________ _________ finish your homework before nine?
2. Li Lei's father stayed in Canada for half a month last year. (对划线部分提问)
_________ _________ _________ Li Lei's father stay in Canada last year?
3. The teacher went home after the students were safe. (改写句子，句意不变)
The teacher_________ _________ home _________ the students were safe.
4. "Do you help with the housework at home?" The teacher asked Lucy and Lily. (改为复合句，句意不变)
The teacher asked Lucy and Lily_________ _________ _________ with the housework at home.
5. It was raining heavily, but all the farmers went on working in the fields.( 改写句子，句意不变)
_________ _________ the farmers_________ working in the fields_________ it was raining heavily.
6. They must cut the meat into pieces before they sell it in the supermarkets. (改为被动语态)
The meat_________ _________ _________ into pieces before it_________ _________ in the supermarkets.