Where is Shanghai?—It is ______ the east of China.[ ]

Aron ______ water five days later.

I felt it hard to keep up with my classmates. But when I want to _____, my teacher always encourages me to work harder.

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

Where is Jack? —-On the playground. He _______ football with his classmates.