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Scientists in Florida will release 750 million [genetically / genetic] modified mosquitoes into the wild. The aim [be / is] to reduce the number of [existing / existed] mosquitoes that have diseases like Zika [virus / viral] , yellow fever and dengue fever. The plan is to release the mosquitoes next year [of / in] the Florida Keys. This is a long [chair / chain] of tropical islands stretching 170km south of the southern [tip / top] of Florida. The modified mosquitoes are all male. They carry a protein that will kill [on / off] any female offspring before they reach biting age. It is only female mosquitoes that [feed / food] on blood and bite humans. Males only feed on nectar from flowers. Over time, scientists hope the disease-carrying population of mosquitoes in the area will [fall / down] .

Environmental groups are not happy [to / with] the plan to release the genetically modified mosquitoes. One group called [them / it] a "Jurassic Park experiment". It said Florida was "a testing ground [to / for] mutant bugs". Many environmentalists warn that the project could [because / cause] damage to local ecosystems that could never be [reversed / reserved] . They say the experiment could even create a new super-species [off / of] mosquito that is resistant to insecticides. The environmental [grouped / group] Friends of the Earth said: "The release of genetically engineered mosquitoes will [need / needlessly] put Floridians, the environment and endangered species [on / at] risk in the midst of a pandemic." The company releasing the mosquitoes said there was no [risk / risky] .