1. Dog is my favorite animal because they are good companions of people
2. I don't like pizza but a friend of mine is fan of it
3. They were stuck in the traffic for hours while they managed to get there on time
4. I was coming to the party when everyone was leaving
5. This time Jane works very hard because she doesn't want fail the exam again
6. I seldom do exercises but doing exercises is very good for health
7. My computer is old-fashioned so it functions very smoothly
8. I didn't know her real name because people always called by her nickname

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2. but
3. when
4. If
5. unless
6. unless
7. before
8. for
9. because
10. If

1. Dog is my favorite animal because they are good companions of people
2. I don't like pizza but a friend of mine is fan of it
3. They were stuck in the traffic for hours while they managed to get there on time
4. I was coming to the party when everyone was leaving
5. This time Jane works very hard because she doesn't want fail the exam again
6. I seldom do exercises but doing exercises is very good for health
7. My computer is old-fashioned so it functions very smoothly
8. I didn't know her real name because people always called by her nickname
 
 

because 
but
ưhen
if
unless
unless