We shouldn’t think the question of ________ they are poor or rich is important.

The fire destroyed all _______ was in the building.

. --- What else do you want to know about the cell phone? --- _______ it can be used as a digital camera. You know, I’m into photography.

Have you seen the film “Titanic”,  ____ leading actor is world famous? 

It’s going to be some time _____ he sees his father again, _____ business has just been started in Switzerland．