Scientists are f________ serious ________ in keeping astronauts healthy during long missions., facing serious problems, Governments must a________ urgent i________ like plastic pollution in our oceans., address urgent issues, Many schools are ________with ongoing ch________ with outdated technology and teacher shortages., dealing with ongoing challenges, The UN report highlights k________ ch_______ in achieving global climate goals by 2030., key challenges, Advertisers should t________ major ________ related to misleading claims and data privacy., tackle major problems, Online learning platforms often e________ unexpected ________, such as low engagement in rural areas., encounter unexpected challenges.

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