阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。
(2012年陕西卷)One sunny afternoon，a sevenyearold girl went for a walk. She crossed a large area of grassland into the woods ____ she realised that she was lost.
Sitting on a rock and ____ what to do，she began crying. After a while，she ____ to walk along a wide path lined with tall trees and thick bushes.____ it was getting dark，she saw a small，dark wooden house. She opened the door and ____ stepped in. Suddenly，she heard a strange noise，and she ran out the door and back to the ____.Cold and tired，she fell asleep near a ____.
The girl's parents were out and her dog，Laddy，was at home. Laddy ____ that his mistress(女主人)was in danger. He jumped ____ a window，breaking the glass. He looked in the fields，but he couldn't find his mistress anywhere. However，from the ground came a ____ scent (气味) as he lowered his head. He ____ the scent and walked across the grassland. Barking ____ into the air，the dog ____ through the woods until he found the ____ .But the girl was not there，so he headed back to the woods. Much to his ____ ，he saw his mistress' blue shirt in the distance. He ____ over some bushes and saw the little stream，where the girl was ____.
When she opened her eyes and ____ her dog standing beside her，the girl said，“you ____ me，Laddy，”and she kissed him several times. Seeing their daughter and dog coming back，the parents burst into tears of ____ .That night Laddy had a hero's supper：a huge meal of steak.

A．before B．since C．while D．as

A．wondering B．forgetting C．remembering D．regretting

A．preferred B．expected C．failed D．decided

A．When B．Until C．If D．Because

A．carelessly B．cautiously C．hopelessly D．unwillingly

A．trees B．bushes C．woods D．grasses

A．stream B．rock C．tree D．house

A．found B．sensed C．heard D．smelt

A．at B．through C．in D．onto

A．terrible B．strange C．pleasant D．familiar

A．missed B．discovered C．followed D．ignored

A．calmly B．loudly C．merrily D．gently

A．searched B．wandered C．looked D．travelled

A．window B．girl C．house D．hero

A．satisfaction B．disappointment C．embarrassment D．delight

A．jumped B．climbed C．walked D．flew

A．awake B．abandoned C．available D．asleep

A．spotted B．watched C．observed D．saw

A．disturbed B．comforted C．rescued D．scared

A．pain B．shock C．sorrow D．relief