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I visited Hong Kong and Singapore respectively seven times.
Both of them are attractive cities not only for sightseeing but also for business.
We can communicate there in English.
The local language in Hong Kong is Cantonese.
Also in Cathay Pacific Airlines, Cantonese is used for announcement.
There are various kinds of Chinese spoken in Singapore.
When I spoke Mandarin to restaurant staff in Singapore, they could not understand me.