The Titanic, the biggest ship of its day, ____ unsinkable, but it sank on its first voyage in 1912.
When you cross the street, you can never be _______ careful.
—I always close all the windows before I sleep. —You’re right. You can not be too ____.
He’s _______ working in Germany as a representative of a Chinese company.
________, he still couldn't afford it.
With the help of the new equipment, our factory produced ________ VCD players in 2001 as the year before.