单项选择题

请根据下面短文回答问题。
Notice for National Day Holiday 2011
National Day Holiday will be from Oct. 1 st to 7th, 2011. We hope everybody will have a good time. During the vacation, please pay attention to the following points:
1. Check the expiration dates(有效日期) of your passport.
2. Do not receive the guests overnight and do not be drunk.
3. If you plan to travel outside of Beijing, please inform the International School in advance and take with the passport and other important forms when you go out.
4. Please pay great attention to your security and obey Chinese laws and traffic rules. If any accident happens, please contact with International School as soon as possible.
5. All the classes will resume on October 8th, 2011.
What is the main idea of the passage