句型转换。
1. We are going to the downtown by bus. (对划线部分提问)
_______ _______ you _______ to the downtown?
2. They are going to hold an exhibition.(对划线部分提问)
_______ are they going _______ _______ ?
3. He is going to the supermarket at 19:00. His friends are going to the supermarket at 19:00.
(合并成一句)
He and his friends are going to the supermarket at _______ _______ _______.
4. He wrote an article to the newspaper. (用next month 改写)
He is _______ _______ _______ 
an article to the newspaper next month.
5. She is going to be an artist. (用an engineer改为选择疑问句)
Is she going _______ _______ an artist _______ an engineer?
