It is obvious ______ the local government can do to protect the environment for the next generations.
His first book ___ next month is based on a true story.
—What shall we do tonight then? ___ —whatever you want
Only when your identity has been checked ___.
The computer was used in teaching. As a result, not only ___, but students became more interested in the lessons.
In such a hurry ___ to the railway station that they left their tickets behind at home.