A huge copy of “Zhang Zeduan’s Qingming Festival at the Riverside” in the Shanghai Expo brings a grand _________of national treasures and cultures to the Expo table.

The practice of hanging clothes across the street is a common_____in many parts of the city.

Teachers have to constantly update their knowledge in order to maintain their professional(专业的)_______.

His name was on the _____ of my tongue, but I just couldn't recall it.

On Saturdays, students are very proud to be         on the street to guide passers-by to obey traffic rules.