I read that Mount Everest is the highest mountain. (no) → I read that _____ Mount Everest

1. I read that Mount Everest is the highest mountain. (no) → I read that _____ Mount Everest.
2. 
 I have never read a better book than this one.ever → This is the _____ read.
3. It’s a university. It specializes in medicine. (specializing) → It's a university
4. 
 I think I’ve met him before.might → I _____ .