Choose the correct "direct object pronoun" for each sentence voy a ver el partido de baloncesto.

The correct direct object pronoun for the sentence Voy a ver el partido de baloncesto is - Voy a verlo.
The direct object pronoun LO that you added to the verb VER replaces the whole direct object EL PARTIDO DE BALONCESTO. So, instead of using the whole phrase, you can just use the pronoun to replace it.

For number 1. The tag question will be: Eva es muy simpática, ¿no? (Eva is very nice, right?)

For number 2. the question will be: ¿Donde es Eduardo? (Where is Eduardo?)

For number 3. The tag question will be: Laura tiene dos perros, ¿no es cierto? (Is it not true that Laura has two dogs?)

For number 4. The question will be: ¿Quien es él? (Who is he?)

For number 5. The tag question will be: El cumpleaños de Juan es el 21 de enero, ¿no? (Juan’s birthday is January 21st, right?)

For number 6. The question word will be: ¿Quien auto hace Jorge or gusta? (Who’s car does Jorge like?)

I think those are the answers you’re looking for, hope this helped.