IF STUDENTS DO NOT THROW PLASTIC BAGS ANYMORE, OUR SCHOOL YARD (CLE...

7. - BAI TAP TU LUAN TIENG ANH LOP 9 UNIT 7 SAVING ENERGY
Lớp 9 BAI TAP TU LUAN TIENG ANH LOP 9 UNIT 7 SAVING ENERGY

7. If students do not throw plastic bags anymore, our school yard (clean) ___________.