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.