When I tried to find _________that prevented so many people from taking part in the program, it seemed to me that there were two main reasons.
. —Have you found the problem with the computer ? —Sorry. It ______ .
—Tom, you are smoking again? —______? It’s none of your business.
— May I remind you that a Mr. Smith is waiting outside, sir? — Oh, that’s right. I ______ about it.
They will fly to Washington, ______they plan to stay for two or three days.
—I’ve told Nancy many times about the meeting, but she still forget it! —I understand. Actually, anyone ______ be very forgetful at times.