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Bài 4. Dựa vào từ cho sản, viết câu hoàn chỉnh.
S+V(HT), S +will+ V1.
1. If people don't stop dumping waste into rivers/pollution will increase.
2. If/ polar/ ice caps/ melt/ huge landmasses/ be/ under/ water.
3. If the air/ in/ city/ be polluted/,it/can/ cause/ people's/ respiratory/ problems.
4. If smog/ be/ frequently/ formed/ in/ city/,it/ cause/ difficulty/ in/ breathing/headache/ even/ lung
сancer.
5. If carbon monoxide/ concentrate/ in/ great/ amounts/, it/ be/ hamful.
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.