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1. The letterbox wasn't emptied this morning. - Active?
2. Over one-third of the candidates have failed the exam. Passive?
3. Unfortunately, your car has been badly damaged. Passive
4. The repairs will probably have been completed by 4.30pm. Passive
5. They will definitely have published the book by next January. Passive
6. He was shocked when he heard the news. Active
7. The roof got blown off in the hurricane. Active
8. All my friends were very interested in going to see the new movie. Active
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Hi Welcome to English Forums.

Have a look at your sentences again and identify the subject. If it was done by the subject it is active if done by anything else it is passive. Have a think and then repost your new answers and then I'll help you further.
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1. The letterbox (subject)wasn't emptied this morning. - Passive
2. Over one-third of the candidates have failed the examActive because subject failed??
3. Unfortunately, your car has been badly damaged. Passive
4. The repairs will probably have been completed by 4.30pm. Passive
5. They will definitely have published the book by next January. Passive
6. He was shocked when he heard the news. Passive
7. The roof got blown off in the hurricane. Passive
8. All my friends were very interested in going to see the new movie. Active
Not sure I have been on every site possible.
1. The letterbox (subject)wasn't emptied this morning. - Passive
2. Over one-third of the candidates have failed the exam Active because subject failed??
3. Unfortunately, your car has been badly damaged. Passive
4. The repairs will probably have been completed by 4.30pm. Passive
5. They will definitely have published the book by next January. Passive
6. He was shocked when he heard the news. Active
7. The roof got blown off in the hurricane. Passive
8. All my friends were very interested in going to see the new movie. Active
Not sure I have been on every site possible.
Hi, Johan

The voice used in a clause determines whether the subject is doing the action of the verb or is being acted upon by the verb.

Active voice: I walked home yesterday. (The subject, I, is doing the walking).

Passive voice: I was driven home yesterday by my friend's mother. (The subject, I, is being acted upon. Someone else is doing the action of the verb, namely the 'mother.')

The passive voice invariably follows this pattern: S + verb to be + past participle
Johan Belinda Guy1. The letterbox (subject)wasn't emptied this morning. - Passive [Y]
2. Over one-third of the candidates have failed the examActive because subject failed?? [Y]
3. Unfortunately, your car has been badly damaged. Passive [Y]
4. The repairs will probably have been completed by 4.30pm. Passive [Y]
5. They will definitely have published the book by next January. Passive [N]
6. He was shocked when he heard the news. Passive [N]
7. The roof got blown off in the hurricane. Passive
8. All my friends were very interested in going to see the new movie. Active [Y]

I think 7 can be seen as passive voice. 'got' is used instead of 'was.'
Students: We have free audio pronunciation exercises.

I Was driven here by my mum