Answer:
For the first three blanks, I would say use "lo" because, it means 'it', "i can find it if i search well. I think -- where can I find it?". If you just plug the words into the sentence it would all come together! For the last blank use 'la, los,or las" whichever floats your boat :) Explanation:
1: conoció
2:quiso
3:quisimos
4:pude
5:conocieron
6:no pudo
Yo - oigo
Tú - oyes
él/ella/usted - oye
Nosotros - oímos
ellos/ellas/ustedes - oyen
