С. correct the mistakes: 1. this cats are clever. 2. that cars are very expensive. 3. this flowers are beautiful. 4. look at these dog! it is very little. 5. this is right! 6. this houses are on sale. 7. those hen have a very strange colour. 8. this buses are red double-deckers. 9. this bird on the tree is a sparrow. 10. that tv sets over is rather cheap. 11. those boy at the door are the best students. 12. these apple are not tasty. 13. those girl are not students. 14. that coats is very modern. 15. this shoes are cozy and cheap.