Answer:
Part 1
nosotros is "we" if you're both masculine
nosotras is "we" if you're both femenine
in the word bank they don't provide you with "nosotras" so it assumes you're both masculine.
- ella
- yo
- el
- nosotros
- ustedes
- nosotros
- ella
- ellas
- ustedes / vosotros
- ella? (I'm not sure because in english "the class(students)" = they/ellos(plural) but you can also think "the class(room)" is "ella"
- ellas
- ellas
- ustedes
- el
- ellos
Part 2
(not sure why they made ustedes into ud. in the example, but I think they're asking for the same thing above if I'm right.)
- el
- usted / ud.
- usted / ud.
- ustedes
- nosotras (since it added "fem." after the "yo", you guys are both females so its "nosotras")
- vosotros / ustedes
- ella
- nosotros (since it did not imply "yo" being feminine, it is "nosotros")
- ustedes
- ellas