1) A place where a bird lays its eggs. a) helmet b) nest c) sidewalk d) territory 2) To fly down through the air suddenly. a) swoop b) repeat c) expand d) chase 3) A hard hat that is worn to protect your head. a) sunhat b) cap c) woolly hat d) helmet 4) The path made from a hard surface, next to the road. a) bill b) tide c) sidewalk d) territory 5) A disadvantage or something that causes problems a) variety of factors b) industrialization c) drawback d) mass 6) To happen or appear again. a) distinct b) comfortable c) occasional d) recurring 7) Having knowledge of something. a) aware b) occur c) look into d) put up with 8) thin, dry and easily broken a) rotten b) crispy c) dangerous d) invasive 9) a species that is non-native and that harms native species a) invasive b) destructive c) local d) natural 10) dangerous, harmful a) destructive b) beneficial c) rotten d) harmless 11) feeling worried a) temperate b) concerned c) environmental d) calm 12) at some time later a) livability b) generally c) rapidly d) eventually

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