.――Oh, what a pity! All the tickets were sold out.――I'm sure we_______ two, but you were not quick enough.
.It is none of your business ___ other people think about you. Believe yourself.
.I like getting up very early in summer. The morning air is so good ___ .
.___ is known to us all is that the 2010 World Expo will take place in Shanghai.
.We decided to turn to ___ can help us out.
.--- What do you think made Mary so upset? --- __ her new bicycle.