Some scientists think there are _______ 2,000 million flashes of lightning per year.
. She_____ Japanese when she went to Japan for holiday. Now she can speak it freely.
26. 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.