28. --- Did you tidy your room?
--- No, I was going to tidy my room but I ______ visitors.
A. had B. have C. have had D. will have
31. --- How was the televised debate last night?
--- Super! Rarely ______ so much media attention.
A. a debate attracted B. did a debate attract
C. a debate did attract D. attracted a debate
40. The traditional view is ______ we sleep because our brain is “programmed” to make us do so.
A. when B. why C. whether D. that