It is ten years since the scientist ______ on his life’s work of discovering the valuable chemical.
--- Did you see a man in black pass by just now ?---- No, sir. I _________ a newspaper.
________ of talking about the same problem over and over again, he suggested bringing the meeting to an end.
When their first child was born, they _________ for three years.
He recommended that she ______and see the film.
I’m Chinese and I do feel ________ Chinese language is _____most beautiful language. What’s your opinion?