Forthousandsofyearskiteshavebeenmadeandflowabypeopleofallages.
Asimplekitecanbemadewithtwocrossedpiecesoflightwood1.____(glue)toasheetofpaperorplastic.Thenall2.____isneededisaclothtailforbalanceandaballofcord(绳子).
Mostkitefansflytheirkitesjust3.____funbutseriouskitefliersentercontestsandtournaments.Theseeventsareconductedunderthe4.____(rule)oftheInternationalKitefliersAssociation.Kitesareusedforpracticalpurposestoo.TheUSWeatherBureauuseskites5.____(gather)informationaboutwindsandweather.Someofthekitesusedinthisworkcanyscientificinstrumentsandfly6.____(high)than20000feet.
Theflatkite7.____(be)thesimplestandmostpopularkiteandtheboxkiteisanotherpopulartype.Anotherfavoritekitelookssomethinglikeabird.
Tolaunchakiteit's8.____(usual)necessarytorunintothewindforafewfeet.Asthekitebeginstoriseletoutmorelineandgive9.____.someshorttugs(猛拉).
Donotflyakiteneartreesorpowerlines.Alsoyoushouldnotflyakiteinanarea10.____therearelow-flyingaircraft.