II. Fill in the blank with a suitable word in the box.
spend    from        exercise            fit        ride     for     tired      energy       in           calorie
We need calories or (1) to do the things every day. For example, when we walk or (2) a bike to school, we spend a certain amount of (3) and even when we sleep, we also use them. But how many calories should we (4) a day to stay in shape? It’s difficult (5) us to calculate. If people want to keep (6) ,they should remember that everyone should have between 1600 and 2500 calories a day.

We get calories (7) the food we eat. If we get too much food and don’t take part (8) any activities, we can get fat quickly. So besides studying, we should do some (9) , play sports or do the housework, such as cleaning the floor, cooking etc., if we don’t eat enough, we feel (10) and weak.