1. The boys are playing games, and the girls are watching TV.
2. I tried my best in the final test, but the result was not as good as I expected.
3. He lost the key, so he couldn't get into the house.
4. She loves comedies, yet her husband is interested in action films.
5. You must do well in the test, or you will not graduate.
6. Pop music is so popular, for the melody is simple and memorable.
7.1 should practice more for the competition, but my health hasn't been excellent recently.
