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There      students in our school at that time.

Some scientists believe that there will be more robots in       years.

The tall building has ______ floors. And Tony lives on the ______ floor.

       of the land is covered with trees and grass in Pingjiang, Yueyang.
A. Three fives             B. Three fifths            C. Three fifth

      of our classmates are good at basketball.

—The number of the students in our school is about nine ____.  ____ of them are boys.
—I think so.

Ten dollars is not enough to buy the bag. Could you give me ________ dollars, mum？

---Look at that tall building!
---It is _______tallest building in the city.

_____ of the water _____ polluted. We must try to protect our environment.

It is said that _____ of the students like to help their parents with the housework