Careful surveys have indicated that as many as 50

Careful surveys have indicated that as many as 50

Fossil records indicate______existing in the past have become extinct.A．that many species

Technological advances have produced many benefits as well as problems in our life. Howeve

The writer mentions______as a pair to indicate that people should have moderate feelings o

Woman: What an accident! If you have been careful, things would not be as they are. Man: W

These surveys indicate that many crimes go ________ by the police mainly because n