1. He is a curious boy. He is always asking questions. (Curiosity)
2. All the pupils have done the exercises easily. (easy)
3. Keep silent! The teacher is explaining the lesson. (silence)
4. Be careful in your work. (care)
5. Time passes slowly when you are alone. (slow)
6. He drives carefully. He rarely has accident. (care)
7. Ho Chi Minh city is an important commercial centre. (commerce)
8. We have a weekly newspaper in this town. (week)
9. This exercise seems difficult. (difficulty)
10. Mrs. Green can help Alice to make a good choice. (choose)
11. He has recently bought a new car (recent)
12. How expensive the dress is! (expense)
13. How beautiful - those shopwindow are! (beauty)
14. She has finished her best performance. (perform)
15. The cartoon last night was very interesting. (interest)
16. She frequently goes to the movies with her younger sister. (frequency)
17. Last night the singer sang very well. (good)
18. The story is about an exciting trip. (excite)
19. In May the days often lengthen. (long)
20. He got rid of the smell by opening a window (smell)