I/choose the best answer:(GHI DẤU HIỆU NHẬN BIẾT THÌ MỚI ĐƯỢC CTLHN) 6/fumes from the cars (causes/lead/result/make)people cough 7/Noise pollution happens when the loudness of sounds is more than (20 dBs/30 dBs/50 dBs/ 70dBs) 8/too much carbon dioxide (CO2) in the atmosphere (causes/lead/result/make) global warming 9/Waste from households will gradually (contamination/contaminate/contaminant.contaminated) the lake 10/the (dead/die/death/died) fish are floating in the water 11/Because the water is polluted , (aquatic/electric/chemical/fresh) plants to may also die 12/(noise / headache / earplug /symptom) is any sound that is loud and constant 13/do you know what ( polluted / pollute / pollution / pollutant ) cause air pollution 14/(poison/poisounous/poisoning/poisoned) chemical waste is dumped into the river by many factories