He stumbled(绊倒)on the _______ ground and fell flat on his face.
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.
Those who are not active or______ diet is high in fat will put on weight quickly.
He is kept in the dark and is not _______ that the company is losing money.