Answer:
Basically, you conjurgate the words in parenthesis based on the context of the sentence. For example, #14 across states "Ella y yo (vender)." You conjurgate vender into vendemos because "Ella y yo" means "Ella and I", or "we", and in spanish, "we" means nosotros. The nosotros version of vender is vendemos, or otherwise stated as nosotros vendemos. Below are my guesses of the rest of the answers, it's hard to confiirm without the full picture.
Across:
#2: vive
#4: comes
#6: volve
#9: tomas
#10: ayuda
#11: jugo
#12: abre
#13: comemos
#14 vendemos
#17. pasa
#18: escriben
#21: visitas
#22: nada
#23: practico
#24: como
#25: hablan
#26: bebe
Down:
#1: pintan
#3: bailamos
#5: investiga
#7: viajo
#8: aprendo
#9: trabaja
#13: cantan
#15: corren
#16: compra
#18: estudian
#19: caminamos
#20: buscas