To do some voluntary work for the 2nd Youth Olympic Games is ______ excellent chance for us to serve our hometown—Nanjing.

.I think _________ of the materials I listened to at the beginning of the exam ____ easy.

The wind was blowing _____ and there was no _____ in the sky．

Can you make a kite for me?— Sorry, I _____.

I had ______ interesting experience on Sunday.