1 We'll take the early_____from Sydney to Wellington(fly)
2 Niagara Falls on the border of the USA anfd Canada is one of the most _______scenery in the world (spectacle)
3______waste spills can contaminate groundwater(industry)
4_______elements have been found in both ground and underground water sources(pollute)
5astronomers are concerned about light pollution because they have _______ in viewing activities in the sky and outer space (difficult)
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Sinh Học lớp 12
