Here are the correct answers based on the passage provided:

**21. How did Sara get most of her models?**
**A. They were gifts.**
(Sara states that some models are gifts from friends and family, and she bought most of them.)

**22. How many models does Sara have?**
**D. fifteen**
(Sara mentions she has fifteen models.)

**23. What is her favorite model?**
**A. a car**
(Sara’s favorite model is her MGA car model.)

**24. Who does Sara build her models with?**
**C. her sister**
(Sara states that her sister, Alice, does it with her.)

**25. Why does Alice film them building models?**
**B. for her vlogs**
(Sara mentions that Alice films their model building for her vlogs.)

For the rewriting sentences:

**26. Your house is more expensive than mine. (is not)**
=> My house is not as expensive as yours.

**27. This film is more interesting than the one I saw last week. (not as...as)**
=> The film I saw last week is not as interesting as this film.

**28. This dress is the same as that dress I bought last week. (different)**
=> This dress is different from the dress I bought last week.

**29. Linda likes reading novels than watching films. (prefer)**
=> Linda prefers reading novels to watching films.