阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选出能填入相应空白处的最佳选项。

summEr holiDAy CAmps (夏令营) For ChilDrEn BEgAn in thE usA、ovEr sixtEEn yEArs Ago. toDAy thErE ArE{{u}} (41) {{/u}}thAn 8,000 CAmps in thE unitED stAtEs AnD EvEry yEAr{{u}} (42) {{/u}}Four million ChilDrEn pAss through thEir gAtEs{{u}} (43) {{/u}}junE AnDAugust. somE{{u}} (44) {{/u}}By Bus EvEry DAy From thE nEArEst town. {{u}} (45) {{/u}}stAy As CAmpErs For onE or two wEEks. quitE A lot oF ChilDrEn go oFF to CAmp{{u}} (46) {{/u}}thE wholE oF thE summEr holiDAy. thE pEoplE thErE ArE young AnD{{u}} (47) {{/u}}. thErE is gooD FooD AnD lots oF intErEsting things{{u}} (48) {{/u}}. in mAny CAmps ChilDrEn lEArn things{{u}} (49) {{/u}}Cooking AnD DrAwing piCturEs.EvEry EvEning thErE ArE CAmp FirEs AnD gAmEs.EvEryonE goEs to BED{{u}} (50) {{/u}}But hAppy.

A．

tiring

B．

tirED

C、

tirEs