Complete the dialogue with the words in the box. see          happen      afraid      mean    how 
A  What’s wrong?
B  I’m (1) I burnt your birthday cake.
A  Really?
B  I don’t know (2) it happened. You (3) , I set the timer but then a friend called.
A  Your girlfriend?
B  No, Sally’s not my girlfriend. Anyway, I forgot the cake was still in the oven. I didn’t (4) to.
A     Well, you know I don’t like it when other girls call you.
B I know. It won’t (5) again. 
 
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