Решение:
- This book is more interesting than the one I read last month. (Сравнительная степень прилагательного)
- My brother is taller (tall) person in our family. (Сравнительная степень прилагательного)
- She has a lot of friends in this city. (to have, 3 лицо ед.ч.)
- It was cold yesterday, but today it is warm. (to be, Past Simple и Present Simple)
- This exercise is more difficult (difficult) of all. (Сравнительная степень прилагательного)
Ответ: more interesting, taller, has, was, is, more difficult.