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.