He was busy writing a story, only _____once in a while to smoke a cigarette.
The small grocer was at the ______ of the people he owed money to.
Green products are becoming more and more popular because they are environmentally ______.
Nobody could believe what Chloe says because she is ______ changing her mind.
Don't ______.You will ______ new customs and different ways of thinking.
It______ a calm head to find the best solution to such a difficult problem within a short time.