. All substances, ___ solids, liquids or gases, are made up of entirely atoms.
The time is not far away _____ modern communication will become widespread in China’s vast countryside.
I have never been to Beijing, but it is the place _____.
_____ might be expected, the response to the question was very mixed.
Living in the central Australia desert has its problem, _____ obtaining fresh water isn’t the least.
All _____ is a continuous supply of the necessities of life.