One of the solution can be, you can add a text entry question below matrix question.

@rondev 
Where should I allow text entry? I click on "Sunday"? It's weird if I do this.

https://www.qualtrics.com/community/discussion/comment/28501#Comment_28501The "comment" will be all together a different question, on the same page of text entry type.

https://www.qualtrics.com/community/discussion/comment/28502#Comment_28502So you suggest I add one more question below it?

https://www.qualtrics.com/community/discussion/comment/28504#Comment_28504Yes

https://www.qualtrics.com/community/discussion/comment/28507#Comment_28507Sorry, I don't believe add one more question can solve it. I also think it's weird if the new question is only one line: comment.

yaozhao, rondev has given you a valid answer to this question. You should follow his recommendation. It matches the format you requested in your picture above. If you feel weird about the question just saying "Comments:" then expand upon it some - although just using "Comments" is common practice in the surveys that I design for UW. It doesn't offend our respondents and it actually saves them time of having to read overly verbose text - it is a way of showing respect to your respondent although it might seem curt. I support rondev's recommendation and if you need something more substantial than comments recommend you label the open text question:
"Please provide any comments you have about scheduling programs. (optional)"

@bstrahin,
Thank you! I use this method and it looks well. I also "add page break" before and after these 2 questions (or 1 question according to the original survey). Do you recommend this option? I think by adding page break before and after can force these 2 questions are shown up on the same page.

yaozhao yes, I agree you should use page breaks the way you described. It gives the respondent extra context if they decide to provide a comment (e.g. they can see their answers and what the comment is supposed to be about to write a meaningful answer in the open end). I'm a big fan of using page breaks over the questions per page function. This allows you to control the breaks so that a page has flow and purpose to it. Being thoughtful in your page breaks enhances the respondent experience.