The language system must constantly _______a new environment and situation to survive and flourish.[ ]

John thought it wouldn’t be longhe was ready for his new job

The government has to close those small factories to prevent the water of the river ______.

It`s nice Never before ____such a special drink! —I`m glad you like it

A pen is on the right of a ruler. The ruler is on the right of an eraser. That is to say, the ruler is ______ them.