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 When you     at the door, I     some washing. A. knocked... did B.was knocking…did C. knocked......

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before    as    when    while  
OK, I will.  No, I won't.  No, I don't.  Yes, I do.  
No, I won’t    No, I will    Yes, I won’t    Yes, I will  
how I can open the door.  if you watched TV last night.  When did the program start.  you had finished your homework.  
reading    reads    to read    read  
wanting    about    up    having  
locking    lock    to lock    locked  
read    reads    to read    reading  
read  reads  to read  reading  
read    reads    to read    reading  
read    reads    to read    reading  
I'm going to  I shall  I will  I have to  
read    reading    reads    to read  
read    reads    to read    reading  
Yes, I do  No, I won’t  No, I don’t  OK, I will  
closing ; Certainly not    to close ; Not at all    closing ; Never mind    to close , I don’t care  
read    reads    to read    reading