Answer:
Use tú for informal situations such as with a friend, children, young people, people you know very well. Use usted (Ud.) for formal situations such as in a job interview, in a bank, with elderly people, with someone you don't know or you have just met
Explanation:
17 ) recibió
18 ) prepara
19) comemos
20 ) pone
12/pm= doce del mediodía
12/am= doce de la noche or medianoche
La ciudad mas grande en Ecuador es Guayaquil
