根据句意及所给中文提示或英文解释，写出句中所缺单词，每空限填一个单词。
People like travelling in _________ (春天) because it is neither too hot nor too cold.
—What’s your father’s ________ (职业)?
—He is a doctor.
The 30^th Olympic Games will be held in London, the ________ (首都) of England.
Lucy is polite and _______ (乐于助人的). We all like her.
Our maths teacher asked you to go to his office ________ (立即). He is waiting for you.
Colours can change our moods and some may make us feel _________ (in need of sleep).
Hurry up, or we can’t ________ (arrive at) the railway station on time.