按要求完成下列各题。

1. I had a good trip. (变为一般疑问句)

    ____________ ____________ ____________ a good trip?

2. It's 5: 15 pm. (就画线部分提问)

    _______________________________________________________

3. This is our friend Danny. (变成否定句)

    _______________________________________________________

4. He's at the airport. (就画线部分提问)

    _______________________________________________________

顺时针调整加油机流量测量变换器调整旋钮可以使加油机少付油。