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1. Although the forecast said it would rain, it turned out to be a beautiful day. 

2. I'm no better even though I've taken a bill. 

3. I told the absolute truth, but no one would believe me. 

4. He didn't notice the sign though it was right in front of him. 

5. Jason was very tired because he leant back and closed his eyes.

6. I'm learning French and I like learning French. 

7. Tim is sleep, so you can't speak to him at the moment. 

8. He wore glasses and false beard so that nobody would recognize him. 

9. Since Nick had nowhere to go, he slept on the park bench.

10. Simon was busy, therefore he couldn't come to the meeting. 

II/

1. Although he often tells lies, many people believe him. 

2. She didn't eat much, although she was hungry. 

3. Although Hi is over 60, he doesn't wear glasses. 

4. Although it got dark, they continue to work.