Complete the sentences.Use the comparative or siperlative form of the adjectives.1)An elephant is____(heavy) than a dog.2)Anna

1) An elephant is heavier than a dog. 2) Anna is the tallest girl in her class. 3) It rained all week. It was the worst holiday we are ever had. 4) Trains are usually faster than buses. 5) I think playing chess is more interesting than playing computer games. 6) It is the most expensive CD I\'ve ever bought.