One day, a fox was looking (a) _____ food. He (b) _____ some grapes hanging (c) _____ a tree. The grapes looked tempting and (d) _____. The fox jumped to catch them (e) _____ failed. He tried (f) _____ and again but could not reach them. At last, he said, "(g) _____ grapes are sour!" and walked (h) _____. This story teaches us (i) _____ lesson: we (j) _____ not give up so easily.