根据汉语提示，完成下列单词的拼写，使句意通顺。
I need some________(志愿者) to clean up the park.
The Great Britain______( 由……组成 ) of four parts: England, Scotland, Wales and North Ireland．
Henry, don’t shout so n_____（吵闹地）in public.
You won’t pass the driving test u           you practise more.
—The twins can speak excellent Chinese.Who taught them？
—Nobody. They learned it by        （自己）.