21.His father thought he would be____ failure in business. But he turned out to be ____ great success.
A. the; a B. a; a C./; / D. a; the
22._______you sing so well. You are practising every day.
A. No doubt B. No hurry C. No way D. No wonder
23.We will do our best to make _______ impossible for us to learn English well.
A. this B. it C. that D. what
