有没有儿童用的眼药水:These are (their )oranges.“对括号部分提问 ” 怎么做?

Are these their erasers? These are (their )oranges.“对括号部分提问 ” 怎么做? Are these their erasers?这个句子变成单数句子还变their 吗？ what are these? Their jobs are their life对吗? These girls are _____ (American) . these are my________(Open)questions. these are my______(open)questions These cups are ours. those are ___. These boys haven't made up their minds_______.