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．—Could you do me a favor and take the box up to the sixth floor?
— _______.No problem at all.
A. With pleasure B. My pleasure
C. For pleasure D. At your pleasure
22.He failed to come on time ,because his car ______ stuck in the heavy snow.
A. came B. became C. got D. turned
