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．China warned the French President Sarkozy（萨科奇）to ________ the meeting with the Dalai Lama, which, however, didn’t work.
A. call on B. call up C. call in D. call off
22．Motoman, the latest robot developed by Japanese scientists and skillfully cooked a pancake in an exhibition in Osaka earlier this month, showed it could ________ a kitchen.
A. take over B. take off C. take up D. take in
