You can only be sure of_____you have at present;you cannot be sure of something_____you might get in the future.()
A modern city has been set up in _______ was a wasteland ten years ago.
Determination is a kind of basic quality and this is ________ it takes to do jobs well.
The difficulty we now meet with is ________ we can persuade him to tell the truth.
Then Mr Smith told me ________ he was doing was very important.
Would you mind telling me _______ language your friend speaks?