--Do you know when the Chinese custom_________ from? --It's hard to say. But its characteristics__________ the Tang Period.
11. Nowadays,a large number of women,especially those who conicfromthe countryside,____in the clothing industry".A .is working B.works C.work D worked
10、______ of the land in that district ______ covered with trees and grass.
9、The number of people invited ______ fifty, but a number of them _____ absent for differentreasons.
8、When and where to go for the on-salary holiday ______ yet.
7、Every possible means ______ to prevent the air pollution, but the sky is still not clear.