Answer:
Este semestre Victoria tiene muchas clases, pero Laia tiene <u>menos</u> clases.
Explanation:
"Menos" would make more sense, in the opposite of "Muchas." Menos is a comparative word.
A mí me encanta la historia de Europa.
Saludos :)
Con compañeros is the most appropriate time to use tú form.
All others are professional/require show of respect or usted form.
