Read the sentences and choose since or for 
  
1. It has been raining ..... this morning.
    
 
2. She's worked there ..... 1999. 
    
 
3. I haven't phoned home ..... Christmas.
   
 
4. I have studied non-stop ..... 9.15.
 
  
 
5. My neighbour's dog has been barking ..... hours.
   
 
6. The cake has been in the oven ..... half an hour.
   
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