Chia động từ

13. The next train to Bristol (start) 14. In recent decades, people's health (threat) at 8.45 a.m., so I must go now. by many diseases caused by pollution. 15. If you (be) the president, what would you do to help the environment? I w 16. If you want to reduce the light, I (turn off) I will tarif some LED bulbs. 17. I (never witness) any natural disaster in my life. 18. The football match (end) at 9 p.m tonight. 19. The concert (begin) at 7.30 p.m. and (last) two and a half hour. Don't be late. 20. I was doing (do) my homework at 8 p.m. yesterday. C. READING