Answer: Papel
Step-by-step explanation:
The original sentence can be translated to:
"Marisol and Luz are going to start a class of dry techniques. They already have pencils, but they need something in what they can put the drawings on. They need _____"
We know that they have pencils and that they need something in where you can put drawings, the first answer that comes t mind is "paper" (because you need paper to draw in it), which in Spanish is "Papel", then the complete sentence is:
Marisol y Luz van a empezar una clase de técnicas secas. Ellas tienen lápices, pero necesitan algo para poner los dibujos. Necesitan el papel.