Combine 2 sentences into a new one using the given words in bracket. Do not change the given words in any way

Combine 2 sentences into a new one using the given words in bracket.Do not change the given words in any way
1.He used to be a smoker.He hasn't smoked for 3 years (stopped)
2.That's our dog.The postman was bitten by it (bit)
3.No one has a key.We can't get into the house (can)
4.He had a good salary.He was unhappy in his job (in spite of)