Are these sentences correct??
1. Yesterday I had a farewell and welcome party with my colleagues.
2. Because two new men have been assigned to my division and one of my colleagues
will be stationed in Indonesia in a month.
3.I usually do not drink alcohol. Because even a small amount of alcohol gives me a terrible headache or hangover.
4.During the party, the topic of our conversation, somehow, became about our supervisor's girlfriend.
5.We wanted to see her photo and asked him to show.
6. The supervisor asked me to drink up a mag of beer all at once for the photo.
7.My colleagues encouraged me to chug down.
8.Finally I did it. I drank up and the supervisor regretfully showed us his girlfriend's photo.
9.All of a sudden, I got a severe headache and threw up...
10.Today I couldn't get off my bed because I had a terrible hangover. So I called my company to take off in the morning.

Question

Are these sentences correct??
1. Yesterday I had a farewell and welcome party with my colleagues. 
2. Because two new men have been assigned to my division and one of my colleagues 
will be stationed in Indonesia in a month. 
3.I usually do not drink alcohol. Because even a small amount of alcohol gives me a terrible headache or hangover. 
4.During the party, the topic of our conversation, somehow, became about our supervisor's girlfriend. 
5.We wanted to see her photo and asked him to show. 
6. The supervisor asked me to drink up a mag of beer all at once for the photo. 
7.My colleagues encouraged me to chug down. 
8.Finally I did it. I drank up and the supervisor regretfully showed us his girlfriend's photo.
9.All of a sudden, I got a severe headache and threw up... 
10.Today I couldn't get off my bed because I had a terrible hangover. So I called my company to take off in the morning.

Answer

1 and 2 need to be combined into one sentence: Yesterday i had a a farewell and welcome party with my colleagues because two new men have been assigned to my division and one of my colleagues will be stationed in indonesia in a month.
3 should be all one sentence: I usually do not drink alcohol because even a small amount of alcohol gives me a terrible headache or hangover.
During the party, the topic of our conversation somehow became about our supervisor's girlfriend.
We wanted to see her photo and asked him to show it to us.
My supervisor told me if I drank a mag of beer all at once, he'd show us the photo.
My colleagues encouraged me to chug it down.
8 and 9 are fine, but you can end 9 with a period, not an ellipsis.
Today I couldn't get out of bed because I had a terrible hangover, so I called my company to take the morning off.