完形填空
Once there was a father and a son. They were ill-tempered (坏脾气的) and1gave way to others.
One day the father2to ask some friends to dinner in his house. He 3his son to buy some meat in town. 4the son walked towards the town gate, a man was coming from the outside. The gate wasn't5 enough to let two men in and out at the same time. But neither of 6would give way to the other.
They stood straight face 7 face inside the gate hour after hour. But the father was8. "What shall I do? My son hasn't 9 yet. I can't wait any more." He wanted to know what was the10with his son. So he 11 his friends at home, and went to town 12his son.
"You may first take the 13 home for my friends. Let me 14 here against him instead." he said to his son when he knew 15had happened.
线DE交BE于点D，交AC于点E．若AC＝8cm，△ABE的周长为15cm，则AB的长为( )
