Little did he care about his own safety,_______he was in danger himself. 

I am going to do ______ I can ______ him a good impression.   

It is a long time _______they separated, but it won’t be long ____ they meet again.

In the forest____, who made no contact with the outside world.

In his lecture, the professor referred to the belief, in contrast to all other countries, ______the elderly are wise, ______is particularly dominant in the Chinese culture．