. For further ____________, please write to the following address.

It is widely accepted that your babies learn to do things because certain acts lead to_____.

--- How can I use iPhone 4S ?--- Just refer to the _______.

They have considered their high standard of living a(n) ______ for practicing their basic beliefs.

In 21st century universities in the US, there is little room for traditional literature because students feel a lot of         to study science.