Complete with the comparative or superlative form of the given adjectives

1. Cristiano Ronaldo is [ ] than Lionel Messi.
2. Michael Phelps is [ ] swimmer in the world.
3. Serena Williams is [ ] than her sister, Venus.
4. Golfer Tiger Woods is [ ] than tennis player Roger Federer.
5. Yelena Isinbayeva is [ ] female pole vaulter of all.
6. Grzegorz Lato is [ ] Polish footballer of all time.