请教几个单复数问题

请教几个单复数问题1.The mountian peaks(or peak?)are covered with snow.2.The recipients(or recipient) of prizes had their name printed in the paper.3.Rain and frost are natural agents(or agent) that wear away rocks.4.The agenda(agendas)of both meetings are the same.

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1.The mountian peaks(or peak?)are covered with snow.peaks是对的。山峰覆盖着积雪。2.The recipients(or recipient) of prizes had their name printed in the paper.从后面的their来看，应当用recipients.获奖者们的名字都印在文件里了。3.Rain and frost are natural agents(or agent) that wear away rocks.agents是对的。 雨和雾是侵蚀岩石的自然因素。4.The agenda(agendas)of both meetings are the same.agendas正确。 两个会议的议程相同。

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学长厉害

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和学长意见相同。