1、Hello. 2、Good morning. 3、How are you doing? 4、Not bad. 5、What’s up? 6、It’s nice to meet you. 7、It’s nice to see you again. 8、I’m surprised to see you here. 9、Long time no see. 10、How have you been? 11、Hi, there. 12、How are things with you? 13、What’s going on with you? 14、What are you doing here? 15、Hey.