An advertisement is useful in it can persuade customers to but the kinds of goods in the shop.
Studies show that office workers are more ______to suffer from backache because they always sit before computer screens for long hours.
She_____ Japanese when she went to Japan for holiday. Now she can speak it freely.
People are not allowed ______freely at the meeting and they don’t allow ______either.
Traditional works of art from different provinces ______at the culture show of the 2010 Shanghai World Expo.
一Professor Li, ______the student start at once or wait a while? 一At once.