Is David William the owner of a website ______ he encourages people to protect the environment?[ ]

Are there any English story books for us students in the library? —There are only a few, ______

The key you have just gotthe front door

People have planted a lot of trees and grass in order to ____ wind and sand in the desert.

To children, good habits do not come , so parents and teachers need to be their role models[ ]