12.On Oct. 23 , 2008 there was the 6oth sports meet, _____our students took an active part in.
____ it is to collect stamps!
---What do you think of this maths problem? Is it too hard?----Not ___.
Run as quickly as you can, otherwise you ___ in the heavy rain soon.
Show us around the room ___ Premier Zhou once worked, will you?
Lu Xun was ___ the greatest writer in the history of Chinese literature.