.In 1989 an international law was passed to stop people _____ waste into the sea.
_____, the environment of our city has been greatly improved.
Never are we allowed to pursue our economic development______ destroying the environment.
The war and sufferings it caused by the war seventy years ago are the old woman’s ______memories, which can never be forgotten.
When he kept silent, Mr Johnson ______ his approval for our plan.
Digital teaching has ______ our way of learning and excited us to focus in class.