What could a chair say to deal with the situation when a speaker goes overtime in a speech? There are three proper expressions listed in the choices. Choose all of the correct answers.
选项：

A:Well, Dr. Li, I’m afraid time is up; we thank you very much for your enlightening opinions.;
B:Since you have already used up our agreed-upon time, I have to ask you to stop here.;
C:Excuse me, sir, since the time’s quite limited, could you please stop the discussion?;
D:That is all for today. Our next meeting will be on Thursday morning at the same time and place.