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299.Have all the important letters been delivered at the first time?
I'm sorry._______ only 40% of them.
A．It is
B．They are
C．There are
D．It has been
300._______ of the land in that district _______ covered with trees and grass.
A.Two fifth;is
B.Two fifth;are
C.Two fifths;is
D.Two fifths;are
