She is not worth _ .
I just don’t understand _______ that prevents so many Americans from being as happy as one might expect.
—What do you think of _____gifted chemist from London? — Well, sometimes his behavior is beyond ______comprehension.
— Did you remember to give Jack the book? —Yes, I gave it to him ______ I saw him.
— Lucy looks so upset. She ______ the driving test. — It is the second time that she has failed in the test.
She tried hard to keep calm in face of the students, but the sweat on her forehead ______her_______.