根据所给要求，改写下列句子。每空格限填一词。
1. They work on the farm with their parents every weekend. (改为一般疑问句)
______ they ______ on the farm with their parents every weekend?
2. Let's take a picture in front of the fountain.(改为反意疑问句)
Let's take a picture in front of the fountain, ______ ______?
3. The Shanghai International Arts Festival is held once a year. (对画线部分提问)
______ ______ is the Shanghai International Arts Festival held?
4. He was very nervous. He couldn't go on with the job interview.
He was ______ nervous ______ go on with the job interview. (合并句子)
5. I have no idea how I can operate the new machine. (改为简单句)
I have no idea ______ ______ operate the new machine.
6. I'm going to make an early start in order not to miss the train. (保持句意基本不变)
I'm going to make an early start ______ ______ I won't miss the train.