Final answer:
The word that best completes the sentence is lees.
Step-by-step explanation:
The word that best completes the sentence is lees. The sentence is asking if you write and read in Spanish, so we need to use the second person singular form of the verb "leer" (to read). In Spanish, the second person singular form of the present tense is "tú lees".
Learn more about Choosing the correct form of a verb in Spanish