Here are the best options to complete each of the questions:

5. My grandmother is over seventy but she always **B. gets up** early to go jogging in the park.
(Explanation: "always" indicates a habitual action, so the present simple tense "gets up" is appropriate.)

6. Don’t worry. You can park your car at my house. It has a **C. garage**.
(Explanation: A garage is the appropriate space for parking a car.)

7. My **D. mother's brother** is a teacher. He is 43 years old.
(Explanation: "mother's brother" refers specifically to one's uncle, which fits the context.)

So the answers are: 5-B, 6-C, 7-D.