Build a sentence using 'lock and key' phrase..
1. What is the meaning of lock and key?
2. Why it should be locked and key?
3. What is the purpose of lock and key?
4. When it should be locked and key?
5. How is the effectiveness of lock and key system?
6. Why i can't stop thinking about lock and key?
7. I don't want to have any dream about this lock and key.
hu hu hu waaaaa