改正下列各句中的错别字。

①……说得阔气一点，就是我的保母。

②都是些烦锁之至，至今想起来还觉得非常麻烦的事情。

③他是一个胖胖的，和爱的老人，爱种一点花木。

④又不许我走动，拔一株草，翻一块石头，就说我玩皮。

如图，点C是半圆O的半径OB上的动点，作PC$\perp$AB于C．点D是半圆上位于PC左侧的点，连结BD交线段PC于E，且PD=PE．

(1) 求证：PD是⊙O的切线．
(2) 若⊙O的半径为$4\sqrt{3}$,PC=$8\sqrt{3}$,设OC=x,$P{D}^2=y$．
①求关于的函数关系式．
②当$x=\sqrt{3}$时，求$\tan B$的值．

    If you go to Hong Kong by air, you will arrive at Kai Tak Airport. Because there was no enough land, it was built out into the sea. It is in the part of Hong Kong called Kowloon. Kowloon is one of the two big cities in Hong Kong.

    The other city is Hong Kong itself. It is on an island. You can get there by ship or through a tunnel under the sea. Much of Hong Kong is farmland and mountains.

    The population of Hong Kong is over 6 million. Most of them are Chinese. Chinese and English are spoken by many people there.

    Clothes, computers, radios and TVs are made in Hong Kong. You can watch dog—racing or motor—racing. Some places are quiet and beautiful. When you are hot and tired, there are small and cool gardens to rest in. There are also a lot of tall buildings to live in. Hong Kong is also a good place for Chinese cooking. You can enjoy many kinds of Chinese cooking, for example, fish, meat and vegetables. Beijing Roast Duck is famous as well. There is certainly a lot to see and to do in Hong Kong.

    In 1997, Hong Kong was returned to China. It's a part of China.