WHAT THE PEOPLE THROW INTO THE RIVER

4/ - DE THI HK2 THAM KHAO ANH 9 DE THI HKII THAM KHAO NH 20132014
DE THI HK2 THAM KHAO ANH 9 DE THI HKII THAM KHAO NH 20132014
4/ What the people throw into the river? - ……….