----- Nội dung dịch tự động từ ảnh -----
Bài 4. Dựa vào từ cho sẵn, viết câu hoàn chỉnh.
1. If/people/ not/stop/ dumping/ waste/ into/
2. If/ polar/ice caps/melt/huge landmasses/be/ under/ water.
3. If the air/in/city/be/polluted/it/can/
4. If/smog/be/ frequently/ formed/in/city/it/ cause/ difficulty/in/breathing/headache/ even/ lung cancer.
5. If carbon monoxide/ concentrate/ in/ great/ amounts/, /it/be/harmful/.
6. The climate change/ if/ more trees/be/ cut/ down/ for/hardwood/.
7. If/ we/ not/ control/ pollution/ soon//it/be/too/late/.
8. If/we/ not/protect/ frontier/we/ suffer/ many/ from/ natural/ disasters.
rivers//pollution/increase/.
cause/people's/respiratory/problems.