每空选择一种合适的物质用序号填空：①石墨　②食盐　③蛋白质　④洗洁精

（1）常用于除去油污的是_________

（2）家庭常用的调味品是_________

（3）可做干电池电极的是_________

（4）豆腐富含的营养素是_________

将下列句子变为否定句。

1. I have lunch at school.

    I ______ ______ lunch at school.

2. We watch TV in the evening.

    We ______ ______ TV in the evening.

3. They play football after school.

    They ______ ______ football after school.

4. Lucy and Lily like music.

    Lucy and Lily ______ ______ music.