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第101页

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 It means an extra amount of money you give to a waiter or waitress.

 Because the students were too quiet in her class.

 They take off their shoes.

 The writer thinks that cultural differences can make life interesting.

 I would talk to the local people to understand more about their culture.

How to be a good teenager Dear friends, As a ninth-grader, I'd like to share how to be a good

teenager. In study, plan your time reasonably, think hard and enjoy reading. In life, take

exercise actively, eat healthily and choose green transport like walking or cycling. Besides,

stay away from unhealthy lifestyles such as staying up late, and be kind to help others. Let's

try our best to grow into good teenagers! Thank you.