1.............the end of the day, your health is the most important thing.
2 He's ............ a good mood today.
3 Let me sleep .......... it and I'll tell you my decision tomorrow.
4 There's no excuse ............ eating too many sweets.
5 Fruit and vegetables are very high ............ vitamins

Ответ:

1. AT the end of the day, ...

2. He's IN a good mood today.

3. Let me sleep ON it and I'll tell you my decision tomorrow.  

4. There's no excuse FOR eating too many sweets.  

5. Fruit and vegetables are very high IN vitamins.