A：
B：
C：
D：
—What is Lucy doing now? —She _____ a book.
Driving in the mountains can be very dangerous. You can't be ______careful.
Taobao.com is one of ________ shopping websites in China.
老师不要求你们用同样的方式做事情。
Teachers don't it ask you to do things in____ ____ ____
现在世界人口已经超过____ 亿。
，事件
，
则
等于