39. He will stop showing off , if no notice______ of him.
15. As Polly was riding on the train, she sensed that she was _____ by a tall man in a dark coat.
14. Over the long process of evolution, animals have developed their ______ senses, which makes it possible for them to _____ their environments.
13. His ability is beyond question; _____ has been in doubt is ____ he is prepared to work hard
12. Half of the students will have sports, and the rest _____ to be here in the classroom studying.
11. She dedicates herself to her work. She is such a dedicated teacher that her efforts will _____.