Question 1 with 1 blank Esa computadora portátil costó un 1 of 1 (mucho dinero). Question 2 with 4 blanks Mi 1 of 4 (hijo querido) toma su 2 of 4 (cantidad pequeña de leche) y su 3 of 4 (cantidad pequeña de agua) en una 4 of 4 (taza no muy grande). Question 3 with 2 blanks La 1 of 2 (mujer que nunca se casará) vive sola en aquella casa, la que tiene 2 of 2 (flores pequeñas) en el jardín. Question 4 with 2 blanks Jaime se cayó y se dio un 1 of 2 (golpe con la cabeza) contra el piso; como es un 2 of 2 (hombre valiente), no lloró ni dijo nada.

ah, so ustedes and nosotros are my 'go-to' if i am using spanish mainly in the states? interesting, but still slightly confusing, haha."

it seems that you are a little confused about subject pronouns. yo=i, tú/usted=you, nosotros=we, ustedes=you(plural), ellos/ellas=they.

in the case of vosotros, it is an informal replacement for "ustedes" in spain. similar to using "you all" in english.

even though it is not generally used in conversation outside of spain, it is used many times in literature. i would suggest having at least some familiarity to that form, at least to recognize what it is.