Answer: The right answers are:
Tú no llegues.
Usted hable.
Tú no hables.
Tú no estudies.
Usted tenga.
Usted visite.
Ustedes busquen.
Ustedes paguen.
Explanation: Just to elaborate a little bit on the answer, it can be added that this tense in Spanish is known as "imperativo," and it mostly expresses an order, a plea, or an appeal. Although I have included the pronouns, in spoken Spanish is not necessary to use them—you can say "hable" or "no llegues." Finally, the affirmative "usted" command of "visitar" is VISITE ("Visite esa escuela," for instance).
