根据所给要求，改写下列句子，每空格限填一词。
1. My friend likes films about cowboys. (改为否定句)
My friend __________ __________ films about cowboys.
2. We can see electricity when the thunder crashes. (对划线部分提问)
__________ __________ you see when the thunder crashes?
3. Kate is never absent from school. (改为反意疑问句)
Kate is never absent from school, ________ _______?
4. We must do something to keep the environment clean. (改成被动语态)
Something must ______ _______ to keep the environment clean.
5. Jack will leave Los Angeles at the end of this month. (保持原句意思)
Jack _________ leave Los Angeles_________ the end of this month.
6. Don't throw coins here. (保持原句意思)
__________ coins is not __________ here.