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¡¡¡¡Special difficulties Äѵã
¡¡¡¡Exercises A
¡¡¡¡1. at/for 2. to 3. to 4. in 5. on
¡¡¡¡Exercises B
¡¡¡¡1. He is the man we have heard about so much.
¡¡¡¡2. The shelf you put those books on has collapsed.£¨vi.µ¹Ëú, ±ÀÀ£, Í߽⣩