从方框中选择正确选项，完成短文，并将其字母序号写在短文后面的空格内。（方框中有两个选项是多余的）

     Billy was three years old．One day, when he was trying to   1   a bottle of milk from the table, he dropped it．There was a sea of milk all   2  the kitchen floor at once．

     His mother came in．Instead of   3   at him, she said, "Billy, what a great and wonderful mess you have made! Would you like to play in the milk for a few minutes  4  we clean it up?"

    He did．After a while, his mother said, "You know, Billy, whenever you make a mess  5  this, finally you have to clean it up．So, how would you like to do  6  ? We could use paper, a towel or a mop（拖布）．Which do you want to use?"

    Billy used the   7  and together they cleaned UP the milk．His mother then said, "Let's go out and   8  the bottle with water in the yard． Let's see if you can find a right  9  to carry it without dropping it．"

   It was at that moment that Billy knew he didn't need to be   10  of making mistakes．Instead he knew that mistakes were just opportunities for learning something new．