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?。