I think the serious pollution is one of the c_____ for most countries

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Ithinktheseriouspollutionisoneofthec_____formostcountriesIthinktheseriouspollutionisoneofthec_____fo

I think the serious pollution is one of the c_____ for most countries
I think the serious pollution is one of the c_____ for most countries

I think the serious pollution is one of the c_____ for most countries
circumstances 境况
但如果能填词组的话 common problems更好