创业者吧:Their jobs are their life对吗?

Their jobs are their life对吗? Are these their erasers? They are listening to their teacher 帮帮忙 How close parents are to their children Their cakes are to die for.是什么意思? Are these their erasers?这个句子变成单数句子还变their 吗？ The students are working together in their school The student teachers are now doing their teaching （practice）. 翻译：are talking about the surrounding of their houses. Their colors are muted,tinted brown.中文意思谢谢！