A true friend is the one that is coming in the door while      else is going out.

 Computers must be of great use to ________ doing the scientific research. 

The cost of buying a house in Beijing is higher than ______in Luoyang。

Freedom­loving young students dislike being restricted by rules, especially ________ which are “outdated” in their eyes.

October 1, 2009 is a special day, ________ I think, that will be remembered by all the Chinese forever.