31.   Would you mind if I open a window?

32.   Delay might open a window of opportunity for their rivals.

33.   Would you mind if I opened the window?

34.   Can I open a window?

35.   He opened the window and looked out.

36.   The room felt very hot and she wondered why someone did not open a window.

37.   Keith opened the window and leaned out into the cold air.

38.   We opened the windows and let in the glorious evening air.

39.   She opened the windows to ventilate the room.

40.   The burglar used a jimmy to open the window.