UNIT 1 I. COMPLETE THE SENTENCES WITH THE PAST TENSES

12. - BT TRAC NGHIEM LOP 12 CB UNIT1 234 TEST YOURSELF A CO DA
BT TRAC NGHIEM LOP 12 CB UNIT1 234 TEST YOURSELF A CO DA

12. Because he (not/ check) the oil for so long, the car (break) down.