If you have any questions, feel free to ask them.
如果您有任何问题，尽请提出。
Please feel free to ask any questions.
请随便提问。
Please feel free to ask questions as we go along.
在报告进行的过程中，您尽请随时提问。
If you have any questions about this topic, feel free to ask me.
如果您对这个题目有任何问题，请随时提出来。
Please interrupt me at any time if you have any questions.
如果您有任何问题，可以随时打断我。
Please do not hesitate to ask (any) questions.
您尽可以提问，请不要犹豫。