Here are the sentences completed with the comparative forms:

1. I was really excited about the music show last night. My favorite singer sang **more beautifully** than ever.
2. I speak English **more fluently** now than I did last year.
3. At weekends, we prefer listening to my grandmother tell stories. To tell the truth, our mother tells stories **more interestingly** than her.
4. This year the harvest time occurred **earlier** than we had thought, so we missed it.
5. It is much **more densely populated** in my city than in his city.