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3. bending or changing the direction of a ray of light
4. (of a task, problem, etc.) requiring care and skill because difficult or awkward
5. worldwide
8. a mass of diseased or abnormal cells that has grown in a human being's body
9. to make sth cold
12. an area next to a building surrounded by a wall
14. a building with lights on the ceiling that represent planets and stars
15. to achieve or possess sth that is very good
17. to give a formal talk on a specific subject to a group of people
19. a type of molecule
20. showing signs of future success
21. the process by which a liquid changes to a gas due to the increase in its temperature
22. find or identify with great accuracy or precision

1. an expedition to keep watch over an area, especially by guards or police walking or driving around at regular intervals
2. cleanliness
6. to give
7. to give an unofficial name to sb/sth
10. able to be easily carried or moved, especially because being of a lighter and smaller version than usual
11. exactly
13. having a strong effect
16. an object with flat circular ends and long, straight sides
18. accuracy
23. a group of cells in a living organism that perform the same function