It was a tiring day for me.
>> CORRECT! 
First, I wasn’t able to wake up on time so I missed my English class in the morning though I didn’t go to bed late.
>> CORRECT! 
OR >> Although I didn't go to bed late, I wasn't able to wake up on time so I missed my English class in the morning.
Perhaps, I was tired yesterday.
>> CORRECT!
OR >> I guess I was tired yesterday.
Second, I should stay at the office to prepare the seminar to introduce our company and products to our client.
>> CORRECT! 
OR >> Then, I had to stay at the office to prepare for the seminar to introduce our company and our products to our client.
They were supposed to visit our company.
>> CORRECT! 
I should prepare a PT file and practice speaking it because I was supposed to be a main speaker of the seminar.
>> CORRECT! 
*the
Also, I prepared the samples of our products.
>> CORRECT! 
OR >> I also prepared samples of our products.
In the end, some researchers of the client arrived at our company at about 2:30 PM and we started the seminar.
>> CORRECT! 
Fortunately, it ended without any special trouble.
>> CORRECT! 
After the seminar, I was exhausted so I went back home directly after work and took a rest.
>> CORRECT! 
*straight back home after work
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