Jane:
Hello.Is very pleased to receive your letter,please come to China in July,the following are some of China's customs.
Hello to say "hello" or ask "what go?" "To eat it?" "Busy?" To show their care; to be commended,said,"Oh,where,where," or "flattering"; received a gift is usually in addition to say "thank you" said "too polite" to the table courtesy,and then presents a good income; feast,in order to show enthusiasm for the success of a person's health or toast (drink to) when we talk out loud,clink (clink glasses ).
Different cultures,different customs.If you do as the Romans,then may be more happy.
Hope that mentioned above will help you,and wish a nice trip.
Sincerely
Salute!
Hua