Ответ:
2. This is the best book I've ever read.
3. That's the most boring story I've ever heard.
4. Mike is the funniest person I've ever met.
5. Canada is the most beautiful we've ever visited.
6. This is the best meal I've ever had.
7. That's the worst photo I've ever seen.
8. This is the fastest car he's ever driven.