The first textbooks ______ for teaching English as a foreign language came out in the 16th century.
–I _______ as the manager in this company. –May I know since when?
Some foreign media predict that all these reforms will make China a strong and powerful country, ______ that can surprise the whole world.
The building ______ roof we can see from here is a hotel.
We have already said a good deal about the various problems _______ the war.
Theory is ______ in that it can provide a direction for practice.