The teacher is busy ____ teaching.
The Students’ Union was founded for the________of them.
Don’t try to persuade your boss;he won’t have the________of employing me—a flesh student.
Your work experience is a big________in the job market but your poor eyesight will limit your choices.
It was difficult to guess what her________to the news would be.
Achieving a high degree of proficiency in English as a foreign language is not a mysterious ________without scientific basis.