The class was very tired. They couldn't continue the lesson

7. The class was very tired. They couldn't continue the lesson.
8. They can't sleep. They aren't tired.
9. She couldn't watch the movie until the end because it was very boring
10. She is 18. So she can drive a car.
11. All students had to stay at home because it was raining heavily.
12. You can't catch any taxi to the airport because it is very early.
13. The gate is wide and the truck can go through it.
14. Tom was a brave boy, so all his friends admired him.
15. The room was comfortable. We all fell asleep easily.