In China, it is polite to use both hands when giving or receiving objects as a sign of respect. Bowing softly to the elders is customary.
When invited to a home, avoid bringing very expensive gifts, as they may refuse them. Sweets, fruit, flowers (other than the white ones used at funerals)or soft drinks are good choices. Do not give sharp objects (such as knives), green hats, or items related to the number «four», which sounds like «death» in Chinese.
You should deny everything before accepting it as a sign of shyness. When you eat, try everything they have to offer and leave some food on your plate to show satisfaction. Avoid sticking chopsticks upright in the rice bowl as it symbolizes bad luck.