下面短文中的划线部分是错误的，请改正，但不得改变原文意思。

Children and adults enjoy play with kites. ___（1）___

There are a lot of kite festivals and competitions in China,

Japan and many others countries. But kites are not just playthings. ____（2）____

They can be useful on many other ways. Kite flying has ____（3）____

been popular in China since more than ____（4）____

two thousands years. Scientists have been ____（5）____

interesting in kites for a long time. They have used them ____（6）____

for studying weather and for testing new kinds of flying machines.

Recently, scientists have develop many new kinds of kites. ____（7）____

Some of them can pull boats, or lift a man easy. Some can ____（8）____

fly like a plane. Some kites are really beautiful work of art, ____（9）____

and people love it. Kite flying is not only an art but also a science. _____（10）_____