从A、B、C、D四个选项中选出可填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. ------The weather isn’t good enough for an outing, is it?
------Not in the least. We can’t have _______ at this time of the year.
A. a worse day B. a nicer day
C. such a bad day D. so fine a day
22. ________, I think, and the problem could be settled.
A. Making great efforts B. So long as you keep up your spirits
C. If you double your efforts D. A bit more effort
