You are certain to live your dream ____ you make great efforts and lay emphasis on improvements in efficiency.
I sat until after eleven,______in a book.
The workers will go on strike if the demands they ______ put forward are turned down.
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.