University Entrance Examination Day

Maybe this video would help :

• Today is an entrance examination day of all national universities in Japan.
• Today is the entrance examination day for all national universities in Japan.

• Since I couldn't go to my laboratory, I was working at my apartment almost all day.
• Since I couldn't go to my place of work, I was working at my apartment almost all day.

• Today, I wrote an annual report of my study in English, however, it was really difficult for me.
• Today, I wrote an annual report about my progress in studying English. However, it was really difficult for me.

• I wanted to use a lot of conjunctive words such as "therefore", but it is unsuitable for academic texts.
• I wanted to use a lot of conjunctive adverbs such as "therefore", but it is unsuitable for academic texts.

  "therefore" is a conjunctive adverb

• I read some blogs that explain differences between them, but I haven't understood it yet.
• I read some blogs that explain the differences between them, but I haven't understood the subject yet.

• Actually, I had commissioned an institution to correct my short English paper last year, and many conjunctive words, especially "thus" and "hence" were modified.
• I commissioned an institution to correct my short English paper last year, and many conjunctive adverbs, especially "thus" and "hence" were modified.

• In the near future, I will post an article about these conjunctive words for my understanding.
• In the near future, I will post an article about these conjunctive adverbs for others to correct to help with my understanding.

• Since I couldn't go to my laboratory, I was working at my apartment almost all day.
• Since I couldn't go to my office, I worked in my apartment most of the day.

  研究室どうしょうか？研究室は色んな意味がありますので、一般的にoffice使ってもいいと思います。

• So I want to distinguish the word "therefore," "hence" and "thus" well.
• So I want to learn how to distinguish the words "therefore," "hence" and "thus" well.

• Actually, I had commissioned an institution to correct my short English paper last year, and many conjunctive words, especially "thus" and "hence" were modified.
• Actually, I had requested to have my short English paper corrected last year, and many conjunctive words, especially "thus" and "hence" were modified.

  I like Peterf's correction too. This is another way you can say this a little bit less formally. This is something I would say in a more casual conversation.

• In the near future, I will post an article about these conjunctive words for my understanding.
• In the near future, I will post an article about these conjunctive adverbs for others to correct and to help me with my understanding.

This a topic I'm not too familiar with myself so I will watch the video as well. :)

• Today is an entrance examination day of all national universities in Japan.
• Today was the entrance examination day for all national universities in Japan.

  I use "was" because since you seem to be talking about this at the end of the day, it would be more natural to use "was."
  
  After just waking up, you'd say: "Today is Entrance Examination Day!"
  
  After getting home from work at night, you'd say: "Today was Entrance Examination Day."
  
  日本語では、そんな使う方法がありませんか？

• I read some blogs that explain differences between them, but I haven't understood it yet.
• I read some blogs that explain the differences between them, but I don't completely understand yet.

• Actually, I had commissioned an institution to correct my short English paper last year, and many conjunctive words, especially "thus" and "hence" were modified.
• Actually, I had commissioned an institution to correct my short English paper last year, and many conjunctive words, especially "thus" and "hence," were modified.

  American version: ..., especially "thus" and "hence," ... (this is what I've corrected it to)
  British version: ..., especially "thus" and "hence", ...
  
  The difference is the placement of the comma. (I think the British version makes more sense and is more logical). You're Japanese, and no American school teacher will ever count you wrong on a test, so use whatever you want!

• In the near future, I will post an article about these conjunctive words for my understanding.
• In the near future, I will post an article about these conjunctive words for my own understanding.

  This is a perfectly fine expression. I'd just add "own" to make it sound nicer.

Wow! The whole country shuts down for the test? I'd like to know more about this someday :) Do students select schools, or do the highest-ranked students automatically enrolled in the highest-ranked schools?