根据句意，用所给单词的适当形式填空。
He is very _________ (humour) and often makes me laugh.
It’s important to brush your teeth at _______ (little) twice a day.
_______ (luck), they passed the exams and went to their favorite high school.
Help ________ (you) to some soup, boys and girls.
You must tell me ________ (exact) what you would like to do next.