27. He gave in to ______and opened the letter addressed to his sister.
We have every reason to believe that __ 2010 World Expo in Shanghai will be _____ success.
There are some students ______ to have known what they don’t really know, which is really harmful to them.
The _____ boy never dares to see the ____ film again.
--- We expected you yesterday. --- I'm sorry, Iyou to say that I couldn't be here until today.
He is ____our teacher; he is also our best friend.