He was working on a new book ________ I went to see him.
44. He ______ all his time and energy to his work.
43. The Chinese people consider dragon as a ______ of China.
42. ______ this fact, French still has an impact on the English language.
41. This is a ______ problem, which can be seen from her ______ look.
40. It is obvious that lung diseases are____smoking.