He is really an excellent doctor and he is _____ to becoming an expert in this field.
Without your help, I ____the exam last term.
The young man insisted that he_____nothing wrong and___free.
You must be a student, ________you?
We all agreed to her suggestion that we______to the Great Wall for sightseeing(观光 ).
There was a half smile on his face which suggested that he____happy to have given his life for his country.