多项选择题
For Questions 5 to 7, select one entry from the corresponding column of choices for each blank. Fill all blanks in the way that best completes the text.
Although the scientist’s recommendations may have been (i) , the students had trouble following his (ii) presentation and were, therefore, against his proposal.（）
A. absurd
B. realistic
C. ubiquitous
D. organized
E. empirical
F. convoluted