Tom was __________ a happy childhood, ______ most people would like to have.

The wings of the plane, which stretched out for 80 feet, were ______ of its body.

If I find someone who looks like the suspect，my        reaction will be to tell the police. 

You’d be exposed to a lot ______ pollution if you moved to a town with pure water and air.

 With the Internet widely used, a(an)___change has taken place in the way people communicate with one another.