--- Mum, I’m going to visit my aunt. What about a week? --- A week is too long. Try to be back in a ______ of days. 

What ________surprise you gave us by wearing such funny________ at so serious a meeting! 

Niagara Falls is a great tourist      drawing millions of visitors from all parts of the world every year．

       He told me that she had met one of my old friends in the street ________.

My neighbor is very kind. I’ll never forget the ______ she’s done for me.