从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. Japan says its prime minister promised to provide the world with "maximum transparency" about ____ accident at the Fukushima nuclear power plant during _____ telephone call.
A. the; a B. the; the C. an; the D. an; a
22. Everyone here will thank the firefighter for the things they have done to prevent fires______the environment safer.
A. make B. to making C. to make D. from making
23. The government work report by Premier Wen covers a variety of issues, and the prices of agricultural products ______.
A. in common B. in general C. in particular D. in practice
