Помогите, пожалуйста. Я буду очень благодарна. 6 класс Ex.4,p63(W.b) ДАЮ 100 БАЛЛОВ! ​

My grades are better than my best friend's. I'm a good student!Let's go by bus. It's cheaper than the train.Jimmy is more excited than his sister about the party.It's more difficult to learn the violin than the guitar.This song is worse than the group's last song. I don't like it.In this photo you are happier than in the last one.