Ответ:
1. Entering the room, he saw Anna where he had left her.
2. I noticed when I entered that someone had forgotten their umbrella on the porch. 3. He didn’t even read the half-book as he stated that he didn’t like her.
4. When the guests left, she entered the living room and turned off the light.
5. She sat on the couch and wondered why a letter from her father had not yet arrived.
6. The rain stopped, but there was still light fog in the air.
7. I did not know when he left.
8. He did not remember his name and did not remember that he had ever met him before.
9. We went for two hours when we finally saw the lake.
10. A certain amount of time passed before they realized that he had nothing to say.
11. Arriving home, he found out that his sister had just left.
12. When the expedition returned, they told what they saw in the Arctic.
13. She finished packing her bag when her sister knocked on the door.
14. The last days it was very cold, but it did not snow.
15. When everyone left, she went to the phone and quickly dialed the number.
16. When my parents returned, I showed them what I did.
17. Mom tried to calm me down after you left.
18. I was surprised at what progress she made, given how little time has passed since the last time I saw her.
19. Before he reached the door, he met his school friends.
20. He again returned to Moscow, where he lived with his parents in childhood.
21. When they finally parted, he returned to the room and went straight to the table. 22. It was much colder than she had suggested.
23. I knew that they had met before the war.
24. When everyone left, I carefully closed the door.
25. When it dawned, a gale was still blowing, but the snow stopped.