17. Choose the correct variant
Do you mind ... I open the window ?

A) that
B) what
C) because of
D) if
E) that's why,

18. Choose the correct variant ... here until they come.

A) don't to wait
B) to wait
C) waited D) Wait E) waiting

19. Choose the correct interrogative sentence

A) Had they got to sell their own house?
B) Do they have got to sell their house?
C) Have they to sell their house?
D) Did they have to sell their house?
E) Did they have to sold their house?