I think it’s “su”
Su bolígrafo
The word you are missing is " hay " which in Spanish means there is. In the school there is a gymnasium and a theatre also
I believe It’s the last one so you have it correct.
It might be la calentacion global or el efecto de la casa verde
It's "El poncho azul es demasiado caro como el sombrero de color oscuro. Tanto más tan tantos"
