Because:
1. I couldn't go to the party because I had to work late.
2. She was upset because her favorite team lost the game.

Because of:
1. We had to cancel the trip because of the bad weather.
2. He missed the train because of the heavy traffic.

Although:
1. Although it was raining, we still went for a walk.
2. She decided to buy the dress although it was a bit expensive.

Even though:
1. Even though he was tired, he stayed up late to finish his project.
2. She still loves him even though they broke up years ago.

Though:
1. It was a difficult decision, she went through with it though.
2. He didn't win the competition, he performed really well though.