Mr. Smith is busy these days ________ a new book on how to develop a child’s reading skill.
Let’s ______my scientific knowledge and your business skills and start a company.
I’m sorry, but I didn’t mean to keep you waiting here for a long time. Can you______ me?
He had led everyone to ______ that his family was very rich.
The brothers’ doubt is ______ Henry can stay out of jail.
Being a teacher for ten years, he has learned a ____ to remember students’ names.