从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. John said he would pay ______ second visit to China ______ next month.
A. the;/ B. the; the C. a ; the D. a ; a
22. – David, have you donated any money for people in the earthquake-hit areas?
-- Well, yes. Quite a lot, __________.
A. entirely B. actually C. usually D. wholly
