Onwards to Hong Kong

Hi,

We are travelling to China to visit Beijing / Xi'an / Shanghai. We then fly to Hong Kong.

I am applying for an 'L' visa in the U.K.

Do I need to include the H.K hotel in the application? The region options lists all provinces but not H.K or Macau?

Also, what does 'sharing a passport' mean? My Girlfriend is coming with me but we have our own passports?