21. The two scholars worked at the task of writing a preface to the new dictionary for three hours ____last night.
A. at length B. in full C. on end D. in time
22. I can’t read the marks and notes Jim made in the margin. They are too____.
A.faint B. foggy C. transparent D. misty
23. A highly organized system of irrigation is ____Chinese agriculture.
A. typical of B. consistent with C. famous for D. subject to
24. Jack is very ____about wines.
A. aware B. knowledgeable C. learned D. informed
25. As for Ann, I am not sure about her ____in Italian.
A. fluency B. clarity C. coherence D. excellency
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