He is interested in the _______________of old buildin. (preserve)

I.
11. He is interested in the _______________of old building. (preserve)

12. English is a _______________ easy language for Swedes to learn. (compare)
II.
17. The police didn’t interview the witness on the street last night.
The witness ________________________________________________
 

18. Lan hasn’t written to Maryam for a month.

Lan____________________________________.

19. She last wore that dress at her sister’s wedding.

She ________________________________________________.

20. When did you start listening to classical music?

How long________________________________________________.