Question 17. Househoids dump waste into the river, …………………. It is polluted.
A. so B. but C. because D. due to
Question 18. If the factory ……………… dumping poison, all the aquatic animals will die.
A. continue B. continues C. continued D. will continue
Question 19. …………………… pollution in the lake has made the fish die.
A. Noise B. Water C. Light D. Air
Question 20. Air ………………….., together with littering, is causing many problems in our cities today
A. pollute B. polluted C. polluting D. pollution
17a
18b
19b
20d