People are encouraged to speak openly but careless words are to hurt others’ feelings. A.

问题补充：

People are encouraged to speak openly，but careless words are to hurt others’ feelings.

A. possible

B. probable

C. likely

D. sure

答案：

A. possible

B. probable

(答案→)C. likely

D. sure

解析：本题考查形容词辨析。常用sb./sth.be likely to do或it’s likely＋从句，表示“可能”；certain表示“确定的”；probable后常跟that从句表示“很有可能”；be sure to do sth.指“一定，务必去做某事”。