单句语法填空

1．He was very cautious about the job interview, because he was aware of the fact that certain            (opportunity), once lost, can never return.

2．My classmates and I have decided to organize some wonderful singing and dancing             (perform) for them, which will last about 3 hours.

3．Magically, that show remains the Great Jason's best             (perform) to this day.

4．The boy tried to prove himself            (be) a good student and he really proved best.

5．These results are further             (prove) of his outstanding ability.

6．Zhang Yimou has directed many excellent films, with which he won many             (award) at home and abroad.