21．—Tony, where are the cookies? Don’t tell me you _________ them all! Again!
—Yes, I did．I couldn’t help it．They were so good．
A．had eaten B．ate C．are eating D．have eaten
22．—What experience most __________ who you are, Richard?
—My father let me play his guitar when I was three．Thirty-two years later, I still play．
A．proved B．impressed C．permitted D．shaped
