Many people believe we are suffering from environmental disaster _____we radically(彻底地) change the way we live.
Only______ people can have a good understanding of the lecture given by the scientist.
I_______ laughing when my son made a face.
She is an excellent student in our class, and she always________ herself in her studies.
Although I liked the appearance of the house, what really made me decide to buy it was the beautiful________ through the windows.
Betty’s mother died of cancer last year, which had a great influence on her. She her mind to be a doctor to help the sick.