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

A. speed                          B. expectation                        C. improvement         D. treatment

17.A nuclear station may take risk going off due to unexpected incidents.

A. demolishing                B. exploding                                       C. developing                              D. running

18. Be destroyed or removed completely.    A. wiped out              B. got out       C. decreased               D. called out