Adultssometimesenvychildrenwhoplayallthetime____theythemselveshavetowork.rainorshine.
Hepaidtheboy$10forwashingtenwindows,mostof____hadn'tbeencleanedforatleastayear.
Hedidn'tknowwhichroom____.
Asisknowntousall,theage_____childrencangotoschoolisseven.
题目：InvitationLetter邀请与约见函
