How do Gambia residence permit and China passport enter Hong Kong?

If you have a Gungo passport, use it to enter Hong Kong for a short stay.

If you enter Hong Kong with a China passport, you must abide by the transit regulations:

Holders of China protection permits who transit through Hong Kong for another country or region are allowed to stay in Hong Kong for seven days each time they enter the country, without obtaining an entry permit first, but they must abide by the same entry requirements. Including valid entry documents indicating the destination, as well as confirmed overseas travel trains/ships/air tickets.