Here are the conjugated verbs:

5. The doctor advised my father **to give** up smoking.
6. My brother **has lost** three kilos since he **changed** his eating habit.
7. The nurse **is giving** him an injection now.
8. There are many ways **to maintain** your health and fitness.
9. You should **reduce** the amount of dairy products you eat every day.
10. My best friend **has been** on a diet for a month.