1)"Yo necesito comprar nuevos zapatos."
2) "Yo necesito zapatos medianos."
3) "Tambien yo necesito comprar calsetines tamano mediano." (in the word 'tamano' the n suppose to have the curvy line above but I don't have it in my keyboard)
Hope this helps :D
The word that fits would be B. Generosa.
Late but hope it helps.
