Bold answers:
1. Yo __jugar el fútbol.
Answer 1: Yo sé jugar al fútbol.
I know how to play soccer.
2. Yo _a tu hermana.
Answer 2: Yo conozco a tu hermana.
I know your sister.
3. Ella __todos los capitales del mundo.
Answer 3: Ella sabe todas las capitales del mundo.
She knows all the capitals of the world.
Explanation: She knows the names of all the capitals of the world, but she has not visited all of them.
4. Nosotros __Rosman.
Answer 4: Nosotros conocemos Rosman.
We know Rosman.
Explanation: We have been to Rosman.
5. Ellos __hablar bien el español.
Answer 5: Ellos saben hablar bien el español.
They know how to speak Spanish well.