阅读下面短文,选择恰当的单词填空. 每词限用一次, 其中有两项多余.
A is not allowed; B hot; C slowly; D before E stopped the car; F enjoyed themselves; G until H took off their clothes I in the countryside J crowded;
Linda and Betty were both nineteen years old. In June, after a school year was over, they decided to take a vacation____ . They went to several towns and villages, visited some places of interest, saw and heard a lot of interesting things. They____ very much.
One afternoon, they were going to stay overnight in a small town. It was too ____ to go further and they wished they could find a river and swim in the cool water. They were driving the car____ while they were looking around. Suddenly Linda saw a lake not far away. They drove there fast and____ by the lake. They looked around and found a woman sitting on a stone and fishing there. After they ____ and were going to jump into the water, the woman came up to them and shouted, "Sorry, madams. Swimming ____ in the lake!"
"Why didn't you tell us about it____ we took off our clothes?" Betty said angrily. "But it isn't forbidden to take off clothes by the lake," said the woman.
上的一点，则tan∠APB的值是（ ）