____ is known to us all is that the World Expo 2010 will take place in Shanghai.
The door ________ open, no matter how hard she pushed.
No one ________ be more generous; he has a heart of gold.
They were determined to carry out the plan at first, but then we ________ persuade them to change their minds.
—Could I use your pen? —Yes, of course you ________.
When winter comes, _________ spring be far behind?