Thefacthasworriedmanyscientists____the earth is becoming warmer and warmer these years. [ ]

Progress suggests a person’s ability to change the way he is living at the moment and it must ______ a better life and a better way of doing things.

Lucy is a very student, she usually answers the teachers’ questions in her class.

How aboutyour conference—PrettysuccessfulIt allowedboth sides of us to better understand ____ each stood on many issues

___________I come in， Mr. King-Yes. of course. Please sit down at your desk.