Here are the completed sentences:

27. A village **is quieter than a city.**

28. Please tell me something about your neighborhood.
**Can** **you share something about your neighborhood?**

29. It is wrong of us to throw rubbish.
**We mustn’t** **litter.**

30. It is not good to stay up so late to listen to music.
**You should** **go to bed earlier.**

31. Nobody is older than my grandfather in my family.
**My grandfather is** **the oldest person in my family.**