Question Detail

Turn her out.

Let her be turned in.
Let his be turned out.
Let her be turned out.
Let her turned out.
Let her be turn out.

Answer: Option C

1. Open the window.

Let the window be opened.
Let the window will be opened.
Let the window was opened.
Let the window is opened.
Let the window is been opened.

Answer: Option A

2. He arrived at the conclusion.

The conclusion was arrived at by him.
The conclusion arrived at by him.
The conclusion had arrived at by him.
The conclusion have arrived at by him.

Answer: Option A

3. Who wrote this book ?

By whom is this book written ?
By whom was this book written ?
By who was this book written ?
By whom were this book written ?

Answer: Option B

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.