9 The birthday present ..... (send) tomorrow.

Passive voice explanation:

• The passive voice is used to show what happens to the subject.
• It is formed with the verb 'to be' (in the correct tense) + the past participle of the main verb.
• 'Tomorrow' indicates a future action, so we use the future simple passive ('will be' + past participle).

Answer:

9 The birthday present will be sent tomorrow.