根据下面每句句意、汉语提示及英语解释，在句子右边的横线上写出空白处所缺单词的正确形式。
每空一词。
1. Most people in Britain have small ________ (花园) at the backs of their houses.
2. English is a working ________ (语言) in the United Nations.
3. Eating too many ________ (甜的) things bad for your teeth.
4. Having good ________ (the first meal of the day) is very important.
5. Hurry up, or you'll ________ (fail to catch) the school bus.
