一道初二英语缺词填空

一道初二英语缺词填空
Kite flying has benn p( ) in China for over two thousand years.Scientists have been I( ) in kites for a long time.They have used them for s( ) weather,and for testing new kinds of flying machines.R( ) they have developed many new kinds of kites.Some of these can pull boats,or lift a man e( ).Some can fly l( ) a plane.Some kites are r( ) beautiful works of art.Most of them look like animals flying in the sky.People are interested in k( ) ,because kite flying is a kind of e( ) and a science-not only children like flying kites,even many old people like to fly kites,it is f( ) for everyone.