Here are the completed sentences:

1. The film wasn’t very funny, **however** it was supposed to be a comedy.
2. **Although** it was slow, the film was quite gripping.
3. Jaws is one of Spielberg’s first films. **Although** it’s one of his best.
4. **Although** there are some good scenes in the film, overall I didn’t enjoy it.
5. The story was good. **However**, I didn’t like the music.
6. I really enjoyed the film. **However**, my best friend hated it.
7. The special effects were very unconvincing, **however** they spent millions of dollars on them.
8. I found the plot really exciting, **although** I guessed the ending.