Abraham suggests to look for William in the shed.
The best word to fill in the blank would be cubanos.
Cubana- a female cuban
Cubano- a male cuban
Cubanas- more than one female cubans
We are left with Cubanos which means more than one male cubans.
I really hope this helps.
2. I was eating meat (past tense)
Yo estaba comiendo carne
3. I was reading novels (past tense)
Yo estaba leyendo novellas
Yo estaba means I was…. Blank. I translated it from what the sentences said in English to Spanish