Answer:
1: en (not pretty sure abt this one
3: unida (not sure too)
5: jugar
I'm a native spanish speaker and I think this is quite hard lol
It’s A. Or Ser
Explanation I just know
“ El muchacho” would be the best choice because it is asking a question and “mañana, dia, and hola” all have a past tense sort if deal to them.
The underlined word means "Sing" or "to sing"