文档介绍：1.  ,wereringing        ,rang     ,wereringing       ,rang2.                                 .   Whileshe______TV,,washearing  ,,heard       ,heard4.                          .   Whatbook____you______whenI____youatfouryesterdayafternoon?,read,wasseeing    ,read,,reading,saw     ,reading,wasseeing6.                              .   ,thinking,was       ,thinking,is       ,think,is             ,thinking,was8.  ,passed ,,passed ,waspassing9.   ,waiting       ,wait    ,waiting  ,wait10.                         .  Whilemother_______somewashing,,made          ,