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.