Complete the sentences using the information in the brackets. Use the past perfect in negative sentences. Study the example.
 
Example:
We ate at a restaurant last night because I ____________ (buy) anything for dinner. We ate at a restaurant last night because I had not bought (hadn't bought) anything for dinner.
 
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Write only one option (one form).
 
1.  The man was hit by a red car. The driver  (not/see) him.
 
2.  The apartment was dirty. They  (not/clean) it for a long time.
 
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.
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