Complete the sentences using the information in the brackets. Use the past perfect in negative sentences. Study the example.
1.I saw him because he (not/leave) for work.
2.He didn't get the job because he (not/send) all his papers in.
3.The dog was really hungry. Mary (not/feed) it since Monday.
4.In the shopping centre I met a friend who I (not/see) for ages.
5.The thief could walk right into the house because you (not/lock) the door.