She did not cheat on the test, for it was not the right thing to do.I think I will buy the red car or I will lease the blue one.I really want to go to work but I am too sick to drive.I am counting my calories yet I really want dessert.He ran out of money, so he had to stop playing poker.They got there early and they got really good seats.There was no ice cream in the freezer nor did they have money to go to the store.Everyone was busy so I went to the movie alone.I would have gotten the promotion, but my attendance wasn’t good enough.Should we start class now or should we wait for everyone to get here?It was getting dark and we weren’t there yet.Cats are good pets, for they are clean and are not noisy.We have never been to Asia nor have we visited Africa.He didn’t want to go to the dentist, yet he went anyway.
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tnx RowMinWoo :)
haha:-P thats not my true name. pinaghalo ko lang ang name ko at idol ko sa kpop...hahaha. by the way your welcome
btw kpop stinks, no offense
I think this is the answer of your question: 
The computer crashed, so i lost all of my work.

The computer crashed.   1st simple sentence
I lost all of my work.        2nd simple sentence
SO                                joining word (coordinating conjunction

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hahaha... it's my own idea, i see it in my book!!