All the witnesses __________ the groundless accusation of the court

18. All the witnesses __________ the groundless accusation of the court.

A. thanked for          B. objected to            C. congratulated on             D. confessed to

19. Some countries have ____ to sign in the environment treaty.

A. refused          B. denied            C. insisted             D. reminded

20. Jim and Jenny ______ that they were going to get married.

A. commented          B. rumored            C. persuaded             D. announced