.With a ______ expression on her face, she is _______ about what to do next.
With more and more new drugs________,doctors don’t find it difficult to treat patients.
I shouldn’t have accepted the man’s present,but I found it difficult to turn down his________.
Helen always helps her mother even though going to school ________most of her day.
I ________it as a basic principle of the company that suppliers of raw materials should be given a fair price for their products.
We were just about to call him ________his mother came back.