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contaminated


dirty or unfit for use

People in big cities in China often wear protective masks because the air is contaminated with pollution.

contaminated

activists


people who take action in support of a cause

Activists marched through the city’s streets to demand higher salaries for workers.

activists

perilous


full of danger; risky

Firefighters often find themselves in perilous situations when battling a blaze.

perilous

susceptible


likely to be harmed or affected by a particular thing

People who spend time in the sun without wearing sunscreen are susceptible to getting a sunburn.

susceptible

allies


countries that support one another, especially during a war

For decades, the United Kingdom has been one of the closest allies of the United States.

allies
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