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.