5 You must ask for permission to leave the classroom. 6 It's important for shop assistants to be polite and helpful.

Explanation:

The provided text contains two statements that are direct instructions or observations related to social etiquette and politeness.

Statement 5 states: "You must ask for permission to leave the classroom." This is a rule of conduct, emphasizing the need to seek authorization before exiting.

Statement 6 states: "It's important for shop assistants to be polite and helpful." This highlights key qualities expected from individuals in a customer-facing role, focusing on good manners and helpfulness.

Both sentences are declarative and provide information or guidance on behavior.