15－9＝____

8－3＝____

9＋3＝____

14－4＝____

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

One day an ant was drinking at a small stream and fell in. She made all efforts ____ (reach) the side, but made no progress at all. The poor ____ (tire) ant was still bravely doing her best when a dove saw her. Moved by her ____ (determine) and perseverance, the bird threw her a blade of grass, ____supported her like a raft, and thus the ant reached the bank again. While she was resting and drying ____ (she) in the grass, she ____ (hear) a man come near. He was walking along barefooted ____ a gun in his hand. As soon as he saw the dove, he wished to kill it. He would certainly have done so, but the ant bit him in the foot just as he raised his gun to fire. He stopped to see ____ had bitten him, and  the  dove ____(immediate) flew away.  It  was  an  animal  much ____(weak) that had saved her life.

下列句子没有语病的一句是（    ）