句型转换。 1. Mary is good at drawing. Mary is ______ ______ drawing. 2. We will have to get ready for the coming test. We will have to ______ ______ the coming test. 3. He seldom talks at table. He seldom talks when ______. 4. I prefer to walk to school rather than take a bus. I prefer ______ to school to ______ a bus.