句型转换。

1. We should exercise to keep healthy. (改为同义句)

    We should exercise to _________ healthy.

2. To eat a balanced diet is very important.(改为同义句)

    _________ very important _________ eat a balanced diet.

3. She has a sore throat. (改为同义句)

     There is something _________ _________ her throat.

4. There is a lot of milk in the bottle.(改为同义句)

    There is _________ _________  milk in the bottle.