12. Which planet is (closest) to the Sun?

• We need the superlative form here to compare all the planets.

13. Carol sings as (beautifully) as Mary, but Cindy sings the (most beautifully).

• The first blank needs the comparative form to compare Carol and Mary.
• The second blank needs the superlative form to compare Cindy to both Carol and Mary.

14. The weather this summer is even (hotter) than last summer.

• We need the comparative form to compare this summer's weather to last summer's.

15. Your accent is (worse) than mine.

• We need the comparative form to compare your accent to mine.

16. Hot dogs are (better) than hamburgers.

• We need the comparative form to compare hot dogs to hamburgers.

17. They live in a (bigger) house, but Fred lives in a (biggest) one.

• The first blank needs the comparative form to compare the house they live in to Fred's house.
• The second blank needs the superlative form to compare Fred's house to all the other houses mentioned.

18. French is considered to be (more difficult) than English, but Chinese is the (most difficult) language.

• The first blank needs the comparative form to compare French to English.
• The second blank needs the superlative form to compare Chinese to both French and English.

19. It's the (largest) company in the country.

• We need the superlative form to compare this company to all other companies in the country.