Choose the correct option to complete the sentences

1. My dad has given [off|away|back|up] smoking since last year.
2. The fridge gives [off|away|back|up] a bad smell. Are there any expired products?
3. I'm moving to a new country, so I've decided to give [off|away|back|up] all my books and sell the furniture.
4. He will never lend money to anyone else. Adam hasn't given him his money [off|away|back|up] yet.
5. I will never pass this exam. I give [off|in|back|up].
6. You shouldn't give your documents [off|back|over|up] to this person.