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Doris Wai
Doris Wai
Hong Kong
Doris worked in educational publishing, including the BBC and Cengage prior to joining the Post in 2018. She specialises in creating graphics and digital learning content, and has a particular interest in issues related to mental health and wellness.

Found in water, food, toothpaste and dental treatments, this naturally-occurring mineral has been proven to significantly reduce cavities.

Practise your English with our short listening exercises: play the audio; answer the questions; and check the answers at the bottom of the page.

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Practise your English with our short listening exercises: play the audio, answer the questions, and check the answers at the bottom of the page.

Practise your English with our short listening exercises: play the audio; answer the questions; and check the answers at the bottom of the page.

Practise your English with our short listening exercises: play the audio, answer the questions, and check the answers at the bottom of the page.

Practise your English with our short listening exercises: play the audio; answer the questions; and check the answers at the bottom of the page.

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