A huge copy of “Zhang Zeduan’sQingming Festival at the Riverside” in the Shanghai Expo brings a grand_________of national treasures and cultures to the Expo table

There is a new problem________in the popularity ofprivate cars that road conditions need improving.

It______________to plant trees and grass on the hillside.—Yes. They help stop soil from being washed away.

The buses, _____ were already full, were surrounded by anxious people.

Hearing their grandpa was coming, theybegan to ________ the work to prepare for a nice dinner.