句型转换。

1. I am reading a book. (改为一般疑问句)

     ______ ______ reading a book?

2. Catherine is eating dinner. (改为否定句)

     Catherine ______ ______ dinner.

3. Kate is playing the guitar. (对划线部分提问)

     ______ ______ Kate ______?

4. Jim is playing basketball now. (对划线部分提问)

    ______ is Jim ______?

5. Maria is writing to her pen pal. (对划线部分提问)

    ______ ______ Maria writing to?

实务操作题：编制利润表。