_____ is known to us all that the 2012 Olympic Games will take place in London．

Please don’t drop litter _______, you should throw it into the dustbin _______.

I find easy to learn English.

Excuse me. I want to buy some stamps. Where can I find a post office?—I know _______ is not far from here. You can easily find _______.

The village______I was born has changed a lot.