As we know disease prevention in our country is progressing well and that is very encouraging. All students are back to school now and all activities are back to normal. A good and clean environment is essential for each of us. as a student, to create a clean environment at school, for myself I will always wear a mask when going to a crowded place because if a student gets sick the possibility of spreading through The airway will be very large, wash hands with antiseptic water before entering the classroom because there will be lots of bacteria on our hands, always throw the garbage in the right place because garbage is one of the cause of disease outbreaks. In addition, we should check health regularly when there are bad signs. Those are things that not only me but everyone should do. Ai đó sửa lỗi ngữ pháp cho mình với được không ajk.