Do you have any difficulty ________?
We need to get to the root of the problem______ we can solve it.
Albert Einstein was born in 1879. As a child, few people guessed that he a famous scientist whose theories would change the world.
The books on the desk, covers are shiny, are prizes for us.
You _____be careful with the camera. It costs!
Jane’s grandmother had wanted to write children’s book for many years, but one thing or another always got in way.