回答如下：1. Hello
2. Hi
3. Good morning
4. Good afternoon
5. Good evening
6. How are you?
7. How's it going?
8. What's up?
9. What's new?
10. Nice to meet you
11. Hey
12. Greetings
13. Salutations
14. Hey there
15. Yo
16. Howdy
17. Hiya
18. What's happening?
19. How do you do?
20. How's everything?。
