The correct answers are The famous actor is married to a brilliant scientist., Their honeymoon destination depends on the weather., and They are discussing the wedding guest list.

Married to: English uses married to, unlike French (marié avec) or German (verheiratet mit).

Depend on: We say depend on, not depend from (a common mistake from French dépendre de and German abhängen von).

Discuss: The verb discuss is transitive in English, meaning it takes a direct object without a preposition. You "discuss something," not "discuss about something" (unlike French discuter de or German diskutieren über).