30. For years people thought the picture was a(n) _____ Van Gogh, but in fact it's a fake.

　 A. absolute　　　　　　　 B. artificial　　　　　　　 C. genuine　　　　　 D. sincere

29. Ten companies have already joined the organization and will be meeting on a ______ basis.

　 A. ordinary　　　　　　　 B. usual　　　　　　 C. frequent　　　　 D. regular

28. The gate will close ______ two minutes before the train leaves.

　 A. actually　　　　　　　 B. approximately　　　 C. relatively　　　 D. reliably