I'd be happy if someone would answer my question. Thanks in advance.<br/><br/>Are the following 3 correct? If so, what's the difference?<br/><br/>A: I hear you sometimes cheat in exams. Don't do a thing like that.<br/><br/>B: I hear you sometimes cheat in exams. Don't do a thing like this.<br/><br/>C: I hear you sometimes cheat in exams. Don't do a thing like it.