upposed to clean the room, but it is still in a mess. —Oh, I was so busy that I forgot.

If it had not been for your help, I ____ the examination.

ides are determined to get what theywant, and there seems to be no possibility of __________

I knew______ about the car accident because I was in the library at that time.

下列各句中，加点的成语使用恰当的一句是（ ）