阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
This is a true story that happened in Japan      a house was redecorated and the wall inside a room was removed. The inside of the wall was hollow. When the owner of the house removed the wall, he saw a gecko (壁虎) inside the wall. Its tail was pinned by a nail          (come) through the wall from outside.
The owner was very curious why the gecko was still alive. Then the nail caught his eye. Goodness! It is the nail that was driven here ten years ago when the house was built! How amazing it was        the gecko to have lived in the wall in complete        (dark) for ten years!
But on second thought, the curious house owner wondered how this gecko could live through 10 years with its tail           (nail) down and being unable to go anywhere? So he tried to find out how this small creature could be fed. After a little while, there appeared another gecko with food in         mouth! What a shocking scene! For ten years, this little gecko had never failed to feed the trapped one.
The story touched me so        (deep) that it is useless to find out   __  relationships they had between them. Parent         child ? Friends? Lovers?  Brothers or sisters?           last thing we should do is to abandon your beloved in hardship.