______ environmental damage is done,it takes many years for the ecosystem to recover.
— How many students are going to the Great Wall?— ____.
— May I take your order?— Yes, I’d like a cup of coffee, a hot dog and some salad. What about you, Lisa?— ____.
He began to __________ because every means _______ tried already.
It’s said that the old lady died ________.
_________ water to grow is well-known.