One of the most important problems they had to consider was________of public health.
of the land in that district covered with trees and grass.
Progress so far has been very good.______,we are sure that the project will be completed on time.
The water froze inside the pipe,causing it to ________and burst.
New ________ show that the economy of our country is continuing to grow.
—Would you rather_______ there tomorrow? —No. I’d rather he________ there instead of me.