When do people have a headache?  

If we don’t eat (10) _____ , we feel tired and weak.

we should do some exercise, play sports or do the housework (9) _____ cleaning the floor, cooking etc.,  

(8) _____ besides studying, we should do some exercise, play sports or do the housework.

If we get too much food and don’t take part (7) ____ any activities, we can get fat quickly.

If people want to keep (6) ____, they should remember that everyone should have between 1,600 and 2,500 calories a day.   

It’s difficult (5) _____ us to calculate.

But how many calories should we (4) ____ a day to stay in shape?