The medical community continues to make progress in the fight against cancer

15. The medical community continues to make progress in the fight against cancer.
a. speed b. expectation c. improvement d. treatment
16. Let's put off that meeting to next Monday.
a. postpone b. schedule c. arrange d. appoint
17. A nuclear station may take risk going off due to unexpected incidents.
a. demolishing b. exploding c. developing d. running