21. The two scholars worked at the task of writing a preface to the new dictionary for three hours ?____? last night.?
A. at lengthB. in fullC. on endD. in time?
22. I can’t read the marks and notes Jim made in the margin. They are too?____?.?
A.faintB. foggyC. transparentD. misty?
23. A highly organized system of irrigation is ?____?Chinese agriculture.?
A. typical ofB. consistent with?
C. famous forD. subject to?
24. Jack is very ?____? about wines.?
A. awareB. knowledgeable?
C. learnedD. informed?
25. As for Ann, I am not sure about her ?____? in Italian.?
A. fluency B. clarity C. coherence D. excellency?