1. (2021八下·哈尔滨开学考) Chinese people are famous for having good manners all over the world. According to Chinese tradition, _______is accepted in China in different situations.

①knocking before entering the room

②giving clocks to our friends as birthday gifts

③saying others' mistakes out loud to let them lose their faces

④greeting(打招呼) others by shaking hands when attending（参加）meetings

⑤holding our cups with two hands while others are filling them with tea