Good health is __________ most people take for granted— until they lose it .

We can get a lot of useful information on the Internet; ______, the Internet also provides us with a new way of communication

It is ______ that the noise around us is a(n) _______ to our health and well being.

There ’s __________“u” and __________“s” in__________ word “use”.

The rain yesterday was heavy._____, the road were flooded