Final answer:
The word 'esta' best fills the blank in the sentence.
Step-by-step explanation:
The word that best fills the blank in the sentence 'pelicula que tengo aquí. Debes mirar, ____' is esta.
The word 'esta' corresponds to the feminine singular form of 'this' in Spanish, and since 'pelicula' is a feminine singular noun, 'esta' is the correct choice.
For example, you could say 'Esta pelicula que tengo aquí es muy interesante' which translates to 'This movie that I have here is very interesting' in English.
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