6,You can go out to play,____________ you stay away from tro

6,You can go out to play,____________ you stay away from trouble.
A:unless B:though C:in case D:as long as
10,We had lots of _____ to do yesterday,that is why I missed the party.
A:job B:work C:labor D:duty
一定要给我解析啊.我很笨的.
那第六题懂了。
第十题还是不懂，这四个选项为什么是work？排除其他三个的原因是什么？

job---I get a job .我得到了一份工作.说的是就业的工作.
work----We had lots of work to do yesterday说的是我昨天有好多活儿要干.这里的work指要干的事儿,干的活儿.
labor----指劳动力,体力劳动.
The company wants to keep down labor costs.公司想降低劳动力成本（劳动成本）.
duty----职责,责任,应该做的.it's my duty to repor it to police.报警是我应该做的.