What would be a good approach to make sure my advisor goes through all the report? As the question suggests, is it ethical for me to check if my supervisor is reading my whole report/paper? If yes, then can I add a line somewhere in the middle of the report to test whether or not he reads it? For example,


  Please highlight this line if you read it. 


I know that this may irritate him, but I want to verify that he's reading my work.

I tried to add a deliberate error, a very specific and big error just to check if he would catch it or not and the response I got was: "Seems fine just fix the typos and you are not good at explaining this specific thing..." The major errors were never found, which bothers me, as it proves he hasn't read the entire thing.

What would be a good approach to make sure he goes through all the report?

[UPDATE]

Thanks for all the comments, however most of the answers and comments are actually suggestions for me to write proper English, and does not answer the question originally asked that How should a student make his supervisor go through the whole documents?

Also my scientific writing possess all the quality writing, flow, punctuation and style that a good report should have. I have published in good journals, so i do not think that my report writing skill is bad.
I would strongly recommend against putting a "trick" sentence into a report, because it looks immature and unprofessional. Remember that your advisor is someone who may be writing recommendation letters for you in the future, or helping you find a job. You want to leave a positive impression on him, and you do not want to appear ungrateful for the time and energy he has invested in you so far (even if you wish he would invest more). That can only backfire on you.

You wrote in a comment that your major concern is, 


  his all focus is on writing and he never gives me feedback on the main content, which is the primary thing to validate


As a general rule, a good way to get more useful feedback from someone who is very busy is to focus their attention on the specific points you are uncertain about.

For example, when giving your advisor something to read, you can ask him specifically:


I'm not sure about the way I motivated the problem. Can you suggest any changes to that section?
Do you think the assumptions I make at the beginning of Section II are reasonable? Did I do a good job of justifying them?
I'm not completely sure if the results strictly support what I wrote in last paragraph of the Discussion section, what do you think?


By directing your advisor towards your specific questions, you are likely to get much better feedback. (Almost certainly much better than you would get with a passive aggressive approach like putting "trick" sentences into your draft.)

This approach also means that you are taking responsibility for identifying and trying to correct your own weaknesses, which is a very good quality in a student.

Also: if he suggests corrections to the writing of the paper, fix the writing of the paper. Then come back and ask him to read it again, and offer feedback on the contents. Sometimes when the quality of writing in a paper is poor, it becomes very difficult to extract the technical content. It's reasonable for an advisor to ask a student to make a paper readable (by fixing writing issues) before the advisor reads it more thoroughly.