Air, or _______ is called the atmosphere, surrounds the whole world.

It’s helpful to put children in a situation         they can see themselves differently.

 It seemed to me that she was in doubt ________ Timmy lived or died.

 The points put forward at the conference          the government should pay more attention to the poor were widely accepted.

Professor Zhang gave all the textbooks to all the pupils, except ________ who had already taken them.