Comparatives and superlatives

Snakes are (a)   (fast) snails.

London is (a)   (big) Madrid.

Snails are (a)   (slow) snakes.

My literature book is (a)   (difficult) my English book.

Lord of the Rings is (a)   (interesting) Mission Impossible.

Summer is (a)   spring. (hot)

Winter is (a)   summer. (cold)

Jupiter is (big) (a)   planet in our solar system.

Elephants are (large) (a)   land animals on earth.

We bought (expensive) (a)   TV in the store.