Are there sentences right?
1、China has the tradition of Mother's Day send carnation to mother.（中国有母亲节送康乃馨的传统。）
In China there is a tradition sending a carnation to your mother on Mothers' Day.
2、China has the tradition of the Dragon Boat Festival eat ZongZi.（中国有端午节吃粽子的传统。）
During the Dragon Boat Festival we always eat ZongZi.
3、Update address list regulary and sent them to the group headquarter.（定期更新通讯录并发送到集体总部）Update the address list regularly and send it to group headquarters.
4、All of post must to sign in person.（所有邮件必须本人签字。）
All post must be signed for in person.
5、I was majored XX in the university. （我在大学期间主修XX专业。）
I majored in XX at university.
Hello! Here are some corrections that make the English sentences flow better.
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1. In China, it is a tradition to send a carnation to your mother on Mother's Day.
2. During the Dragon Boat Festival in China, it is a tradition to eat ZongZi.
3. Be sure to regularly update the address list so that we can send it to the headquarters.
4. All of the posts must be signed in person.
5. When I was in college, I was a(n) XX major. OR, I majored in XX when I was in college.
