You will never imagine that such a small invention as a kite can    1    （有益） us so much! Flying kites is a popular hobby in many countries of the Far East where
    2    （漂亮） decorated kites appear    3    different colors．In China there is a special Kites Day on which children and    4    fly kites together happily．A flat kite is the oldest and     5    (简单的) type of kite．It flies     6    air flows over and under the kite's wing．The pressure under the wing helps the kite lift into the air．Kites have also    7    used in experiments．Early scientists     8    kites up into the air to measure temperature at different     9    （高度）. Kites were also used to develop airplanes．    10    is known to us that the Wright Brothers experimented with kites before they flew the first airplane．