1. Mr. Wang got out of the library.(改写成过去进行时的句子)
   Mr. Wang ________ ________ out of the library at that time.
2. There were many people in the train station last Sunday.(改为同义句)
    The train station ________ ________ last Sunday.
3. When they got to the airport, the plane began to fly.(改为同义句)
    When they got to the airport, the plane began to________ ________.
4. We were riding to school at seven thirty that day.(对画线部分提问)
    ________ _________ you ________ at seven thirty that day?
5. The boy mended the bike as his father did.(改为同义句)
    The boy ________ his father ________ ________ the bike.