Exercise condition:

4
Choose the future perfect or the future perfect continuous.
  
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1.  By the time you arrive for lunch, we _____ our kids to bed.
    
 
 
2.  This time next month, I _____ here for an entire year.
    
 
3.  By the end of next week, Andrew ____ enough money to afford a new PC.
    
 
4.  By the time her parents return, she_____________English for 3 weeks.
    
Reference:
ec.europa.eu
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