To complete the sentences using the future continuous tense, we need to form sentences that describe actions that will be in progress at a certain point in the future.
Robert will be going to Australia next month.
Here, "will be going" indicates that Robert's journey to Australia will be ongoing at a time in the future. The future continuous tense is formed by using "will be" followed by the present participle (verb + -ing).
We will be leaving for the party at nine o'clock.
Similarly, "will be leaving" shows that the action of leaving for the party will be taking place at nine o'clock. Again, this uses the "will be" structure with the verb "leave" in the present participle form.