The missing word would be tiene.
Ustedes estudian en la biblioteca is the correct answer.
Spanish has verb suffixes for each pronoun, which is something English only has for third person singular (-s, or -es). So, this is how to conjugate the verb estudirar (=to study):
1. yo estudio 1. nosotros estudiamos
2. tu estudias 2. vosotros estudiais
3. el/ella/Usted estudia 3. ellos/ellas/Ustedes estudian
Answer: Ella quiere hablar
Explanation:
It's the best translation because ella means she, quiere means wants, and hablar is to speak.
The question is: With what frequency do you practice sports? So it the answer is once a week, you respond by saying: un tiempo por semana.
