In this exercise, we need to conjugate correctly each verb in parentheses matching the simple present form. The simple present tense is used to talk about habitual actions or routines. This tense is also used to describe things that happen now or in the near future. The verbs in parentheses are given in infinitive, the ending of this type of verbs is ar, er, ir. Hence the correct sentences are:
Ana juega al tenis con Daniel.
Juega matches the third person singular
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Daniel prefiere pasar la tarde charlando con Sergio.
Prefiere matches the third person singular
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Felipe sale a bailar todas las noches.
Sale matches the third person singular
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Yo tengo clase de química a las 8 de la mañana.
Tengo matches the first person singular
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Jorge y Bergoña van a la playa
Van matches the third person plural
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Tú quieres viajar a Arizona.
Quieres matches the second person singular
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Dolores y Tony comen muchas hamburguesas.
Comen matches the third person plural
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Nosotros somos vegetarianos.
Somos matches the first person plural
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Fermín piensa viajar a México con su amigo Mario.
Piens matches the third person singular
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Mario no lo pasa bien con él.
Pasa matches the third person singular. On the other hand, lo is the direct object pronoun for the third person singular.