—Nowadays the doctors are trying their best to reduce the people’s fear        they would be affected by the present disease called “Bird Flu （禽流感）”.

_______ was known to them that the boss had broken his promise______ he would give them a rise.

She may have missed the train,____ she won’t arrive for another hour.

A proposal has been put forward at a recent video conference _______ measures be taken to raise the citizens’ awareness of traffic safety. 

The most important thing_____we should pay attention to is the first thing _____I have said.