—Your city looks beautiful！
—Yes．Lots of trees and grass________last year．
A．are planted
B．have planted
C．were planting
D．were planted
Who were the shoes with special heels invented________？
A．with
B．of
C．for
D．by
—A number of students________in the dining hall．
—Let me count．The number of the students________about 400．
A．are；is
B．is；are
C．are；are
We are very proud of these national________(英雄)．
She put back the book she had taken________mistake．
A．in
B．up
C．to
D．by
________it rains heavily，they go on working outside．
A．How
B．Why
C．Although
D．What
