We will wait for further information, you should keep us .A. heardB. informedC. realizedD.

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A. heard
B. informed
(答案→)C. realized
D. recognized
解析：考查动词：A. heard 听到，B. informed通知，C. realized意识到D. recognized认识，识别，keep sb informed“及时告知某人”，句意是：我们在等进一步的消息，你应该随时通知我们。选C。