.Water and air are _______ to human beings. We can

______ we need air and water, so we need criticism and self－criticism.A．Even thoughB．So lo

Food packages, bottles and tins for drinks can cause ______.A．air and water pollutionB．bot

Weve arranged to go to the cinema on Wednesday, but we can be______and go another day if n

We can t emphasize ______ the importance of air and water for the survival of all species.

We are happy to see that John and Sally can______ with all their problems cheerfully.A．tac

We have made up laws to protect the water from being polluted and the animals _____