题目内容

The increasing population is now a serious_______ problem.(society/social)

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We need to respect other people in the______.(society/social)

His parents went out last night, so he was______at home. (lonely /alone)

Paul was feeling a bit_____then, for he had nofriends. (lonely /alone)

Match thewords to their definitions.将单词和它们的意思连起来。