We are going to stay there for ______ hour.
Animals and plants live Earth.A. on B. on the C. in the
There are books in our library.A. many and many B. more and more C. some and some
We should not cut trees.A. off B. up C. down
The weather is getting in August.A. more hot B. hoter C. hotter
Trees can keep cool.A. us B. we C. our