I.                    Put the word in brackets into the correct form.

1.      One of the functions of the kidneys is to ____________ the blood. (pure)

2.      Thanks to a large gift from an anonymous ____________, the charity was able to continue its work. (donate)

3.      Her students didn’t work ____________ as the teacher hoped. (produce)

4.      I had an active ____________ life when I was at college. (society)

5.      He was criticized for his ____________ and carelessness. (arrogant)

People who learn a new language often encounter some ____________ at first