Bob swims ________ than I, but he doesn’t swim_________ my brother.
-George is not here. What’s the matter with him? -Her father is ill in hospital. She has to_____ him.
Mike went to the library ____ some books the day before yesterday.
Nancy _____ playing the piano at 7pm. yesterday.
The Great Wall of China is ______wall in the world.
_____ is not difficult to learn English well.