In a library (perpustakaan) :
- Shhh! Be quiet! This room must be silent
- Throw the rubish into dustbin
in a laboratory (laboratorium)
- Don't touch anything chemical acid or solute
- Pair in group and dont make it wrong. Follow the instruction
- Don't broke the medium glasses. Make it tidy!
in a class (ruangan kelas) :
- Keep silent!
- Don't throw any litter everywhere