Oh, it's very nice of you to ask me.

哦，你真好，邀请我。

Then why did you ask me all those questions?

那你为什么问我那些问题？

Feel free to ask me anything on today's Great Wall tour.

今天的长城之旅，随时可以问我任何问题。

You can ask me anything.

你可以问我任何事情。

Whatever the question, you can ask me.

无论什么问题，你都可以问我。

If you are in doubt, feel free to ask me.

如果你有疑问，请随时问我。

If you have questions, ask me at any time.

如果你有问题，随时问我。

If you need help, of course you can ask me.

如果你需要帮助，当然可以找我。

If you have any query, feel free to ask me.

如果你有任何质疑，请随时问我。

Of course, you can ask me questions anytime.

当然，你可以随时问我问题。