WHEN FOOD AND GERMS COLLECT IN A SMALL CRACK, OUR TEETH ...A. BECOM...

1. - Đề KSCL giữa kỳ 1 Ạnh 7
Tiếng Anh Đề KSCL giữa kỳ 1 Ạnh 7
1. When food and germs collect in a small crack, our teeth ...A. become hard B. begin to decay C. send poison into the blood D. make us feel quite ill