During the Spring and Autumn Period, the State of Wu launched an attack against  the  State of Yue. The king of Wu was seriously wounded and soon died.__ ___(he) son Fu Chai became the new king. Fu was determined to revenge. He trained his army________(strict) until it was a perfect fighting force. Three years later, he led his army ________the  State of  Yue and caught its king Gou Jian.
In order to avenge his father’s_______ (die), Fu let him live in a shabby stone house by his father’s tomb and ordered him to raise horses for him. Gou pretended to be loyal to Fu,__ _____ he never forgot his humiliation(羞辱).Many years later , he _______(set) free. Gou secretly accumulated a military force after he went back to his own state. In order to make himself tougher he slept on firewood and ate a gall-bladder(苦胆) before having dinner and going  to bed every night. At ______ same time he administered his state carefully，_______(develop) agriculture.  After a few years, his country became strong. Then Gou seized a favorable opportunity to wipe off the State of Wu.
Later, people use it        (describe) one who stands self-imposed（自愿接受）hardships to _______(strong) one’s determination to realize one’s ambition.