All of us are_____aware of the cause of this failure, so do not make the same mistake again.
13.About 90 percent of the equipment presented by the administration,as well as the facilities of our own, ______made good use of in teaching.
12.______of the land in that district_____covered withtrees and grass. A.Two-fifth;is B.Two-fifth;are C Two-fifths;is D Two-fifths;are
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 different reasons.