Final answer:
The verb form 'tiene' is the correct form to complete the sentence.
Step-by-step explanation:
The correct verb form to complete the sentence is tiene.
This is because the subject 'Sara' is singular, so we use the third person singular form of the verb 'tener', which is 'tiene'.
For example, the complete sentence would be: 'Para mi clase de literatura, Sara tiene que leer dos libros.'
Learn more about Verb form in Spanish