Animals that could not ______ themselves to the changed environment perished and those tha

Some animals______well enough in that country.A．have not protectedB．is not being protected

He was so convinced that people were driven by ______ motives that he could not believe th

Everyone was home for the holiday. What could make for ______Christmas than that？A. th

Some species of animals have become extinct because they could not ______ to the environme

The real difference between plants and animals ____ what they do, and not in what th

Still, he could not help thinking that if anything______, the nearest person he could cont