请认真阅读下面各题，从A、B、C、D四个选项中，选出最佳选项,并在答题卡上将该项涂黑。
21. It is believed that ______ European chemist called Felix Hoffmann first produced ASA which completely changed ______ man’s understanding of aspirin.
A. an; a B. the; a C. a; / D. an; /
22. — How many pages have you covered of that book on financial crises?
— I have given up, for it’s ______ me.
A. ahead of B. above C. apart from D. on
