I think it is formal it doesn’t say it formal but it does say the word usted is to show respect so i would say true its formal
1- do you like burgers?
2 - do you like yogurt?
3 - which do you prefer orange juice or milk?
4- what time do you eat breakfast?
5- what do you eat for breakfast?
6- what do you drink for breakfast?
7- At what time do you eat lunch?
8- what do you eat for lunch ?
.. hope this helped :/
Answer:
6 C. su
7 A. Acabo de mirar la película
8. B. Esos tacos son buenos
9 B. No
10 C. Voy a ir a la mueblería
11 B. Pueden
12 B. A conjugated verb
13 C. Yo conozco a Juan
14 D. A él le gustan las frutas
15 D. Vamos
16 A. Madre
17 D. Ud. (Usted)
18 B. Frijoles.
Los idimas se hablan en España es catalán y castellano