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Write down the word according to the explanation. 1. ____________ n. the quality of knowing and understanding a lot about a complicated subject 2. ____________ v. to change or modify 3. ____________adj. hostile or aggressive 4. ____________ adj. difficult or impossible to find or catch 5. ____________ v. to come into existence 6. ____________ adj. exciting 7. ____________ adj. not capable of going wrong; reliable 8. ____________ n. the reason why you want to do sth 9. ____________ adv. having the power to persuade 10. ____________ n. the parts of sth that are left after the rest has been destroyed or has disappeared