Bonjour j'ai des exercices d'anglais mais je ni arrive pas pourier vous m'aider et merci d'avance ​

Ex 2
1/ It is MORE DIFFICULT than you think.
2/ Carl Lewis runs FASTER than Queen Elizabeth II.
3/ A pair of jeans is MORE EXPENSIVE than a T-shirt (= a T-Shirt is CHEAPER than a pair of jeans)
4/I’m BETTER at english than you.
5/ you must work HARDER if you want to succeed your exam.