单项选择题
Since she was alone, she opened the door ______, leavin...
单项选择题Since she was alone, she opened the door ______, leaving the chain lock fastened.
I've never ______ the theory that people are more impor...
单项选择题I've never ______ the theory that people are more important than animals.
The Olympic Games were watched by ______ billions of pe...
单项选择题The Olympic Games were watched by ______ billions of people around the world.
