Here’s a suggested fill for the blanks based on the context:

1. A. ride
2. B. food
3. C. fit
4. A. play
5. B. tired

So the completed passage would be:

“We need calories or energy to do the things every day. For example, when we (1) **ride** to school or ride a bike to school we spend a certain amount of (2) **food** and even when we sleep, we also use them. But how many calories should we spend a day to stay in shape? It's difficult for us to calculate. If people want to keep (3) **fit**, they should remember that everyone should have between 1600 and 2500 calories a day. We get calories from the food we eat. If we get too much food and don't take part in any activities, we can get fat quickly. So besides studying, we should do some activities, (4) **play** sports or do the housework, such as cleaning the floor, cooking, etc. Otherwise, we don't eat enough, we will be (5) **tired** and weak.”