I will never understand how it ______ that you failed in the examination for you are such a good student.
Much to his _____, his father was not angry at the result of the examination.
At the school gate, you should _____ the safeguard with your student card.
Father insisted Tom _____ all his homework before he went to bed.
I met this guy _____ some other occasions but he did not seem to recognize me.
I don’t like the lecture yesterday. Most of what the speaker said was _____ the subject.