1. When skiing, be careful. 2. The book, written by our professor, is very useful. 3. After sending an email to the client, I went to a meeting. 4. I saw a sign with a girl talking to your brother. 5. By evening, our family was at the sea, having flown in the morning. 6. Our repaired car looked much better than three weeks ago. 7. She wrote another message, not receiving a response to the first one. 8. Feeling a headache, she decided to take her temperature. 9. We chatted, first playing badminton, and then swimming in the river. 10. He donated the money earned yesterday to charity.