---It is selfless ______ the doctor to devote all the time he had ________ for the patients.--I think so, they are so great.
I have ________ useful knife and my sister has _______ eraser.
The tall boy ______ you just met is my brother.
-- Peter knows much French. -- ________.
Which sign tells you to go straight ahead? A. B. C. D.
The new teaching building ________ before the new term begins.