The reason for his success is ______ he has worked very hard.
The little boy was watching a late night film at home ________, right in the middle of a thrilling scene, the television went blank.
It sounded like a good idea, but _______it didn’t work.
The quality of the goods in this firm is _______ to the customers, as there has been no complaint since it was founded.
After he retired from office, Tim ________ painting for a while, but soon lost interest.
China has seen _______dramatic decline in rural poverty, but the problem is on _______increase in Africa and South Asia.