将下列句子改为同义句，每空一词。

1. To eat a balanced diet is very important.

    ________very important________eat a balanced diet.

2. They are watching TV at home now.

    They are watching TV at home________ ________ ________.

3. What's wrong with your sister?

    What's________ ________with your sister?

4. She has a sore throat.

    There is something________ ________her throat.

5. There is a lot of milk in the bottle.

    There is________ ________milk in the bottle.