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

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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”。