The book is meant to ________needs it .
The user also wears special gloves to ‘touch’ the people and objects _______ he or she sees.
The traditional view is ______ we sleep because our brain is “programmed” to make us do so.
My friend Jack has just sent me an e-mail, _______ me about his travels around the world.
In the near future, more advances in the robot technology _______ by scientists.
Our parents always tell us to believes in we do if we want to succeed.