23. Mr. Smiths was busy writing a story, only ______ once in a while to smoke a cigarette.
— Did you know any French before you arrived in Washington? — Never ______ it, actually.
---Do you think you can finish the project by five o’clock this afternoon? ---_______. I’ll be busy with my term paper all day.
This hotel is the highest building in the city, from ______ top you can enjoy a good view of our city.
Knowing what colors look good _______ your skin is of great importance when you buy clothes.
— How’s your tour around the North Lake? Is it beautiful? — It ______ be, but it is now heavily polluted.