8 This book ..... (return) to the library yesterday.

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.
• 'Yesterday' indicates a past action, so we use the past simple passive.

Answer:

8 This book was returned to the library yesterday.