根据对话情景，填入恰当的单词。
(Jane meets Kangkang and Wang Feng at the school gate.)
J: G'day, Kangkang and Wang Feng!
K: I can't ____ you. Can you speak more slowly, please?
J: I just said hello to you. In Australia, people say “g’day”____ of “hello”.
W: Is Australian English the____ as British English?
J: Not excatly. For example, in Australia, people call all their friends “mates”. And when they want to say that you have done something well, they use the words “Good on ya, mate” which means “Well done!”
K: Oh, I see. English is____ differently in different English-speaking countries. In Canada, “Sheila” is a girl's name, but Australians call all girls “sheilas”.
J: Yes. Once, when I was in London, my friends told me to put my suitcase in the boot.
W: A boot? Like a shoe?
J: No, “boot” is British English for the trunk(行李箱) of a car.
W: Oh, it sounds interesting. ____ the way, I'm flying to Disneyland tomorrow.
K: Really? Have a good____
J: Enjoy yourself!
W: Thank you.
的平方根之和是（ ）
