Note :- Rule to make active voice of Past Continuous Tense :
Passive subject + was/were + being + third form of verb + by + passive object
3. He asked me what my post was.
I get asked what my post was.
I could asked what my post was.
I was asked what my post was.
I had asked what my post was.
Answer: Option C
4. Someone has stolen his book.
His book is been stolen.
His book has been stolen.
His book is stolen.
His book has stolen.
Answer: Option B
Explanation:
Apart from Rule to make active voice of Present Perfect Tense, which is
Passive subject + has/have + been + third form of verb + by + passive object
Please also note that words like, "someone", "somebody", "people", "police", "public" etc are dropped. But in rare cases we can use them if sentence meaning is not clear.