Generally speaking, the topic of audit is easy to write, but judging from the questions you provided, the scope of audit is quite wide. I personally think: 5. Comparative study of internal audit at home and abroad: 6. Evaluation of the status and role of internal audit in China. It may be better, because we still need to study some factors of the general environment. It may be more convincing to cite an example of internal and external audit problems as evidence, but if it is not too big, it will not be well demonstrated, or even if it is demonstrated, it will be superficial and not in-depth.