21.To our disappointment, her cancer failed to ______ to our treatment but got worse.
A. answer B. appeal C. attach D. respond
22.Can you imagine how lucky we were? We had a narrow ______ when a tree fell just in front of our car.
A. appearance B. escape C. exit D. entrance
23.3,000 dollars a month? He ______ better than this since he has been working so hard for the company.
A. claims B. contains C. deserves D. declares
