"Back to school vocabulary": HTML5 Crossword

Across

4. When you're cautious and pay attention to details, you're being (7)
7. It helps you stick things together: (4,5)
10. A subject in school that involves numbers, calculations, and problem-solving: (5)
12. When you have lots of things to do, you're (4)
13. It's used to fasten pieces of paper together: (7)
14. The subject that teaches about countries, maps, and the world: (9)
16. If a task is not hard, it's (4)
17. You keep your pencils, pens, and other writing tools in this: (6,4)
18. If something is challenging or not easy, it's (9)
19. If something is not interesting or dull, it's (6)
20. When something is full of action and fun, it's (8)

Down

1. When you do something with great speed, you're doing it (5)
2. You write in it during class to take notes: (8)
3. It helps you draw straight lines: (5)
5. The opposite of fast: (4)
6. The study of past events, famous people, and how things were in the past: (7)
8. A language spoken in Spain and many other countries: (7,8)
9. You use these to cut paper or make crafts: (8)
11. You carry your books and school supplies in this on your back: (8)
15. This helps you fix mistakes by rubbing out pencil marks: (6)