同义句转换，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.