最后他们决定自己保守这个秘密At last,they _ _ _ the secret _ _.
问题描述：
最后他们决定自己保守这个秘密At last,they _ _ _ the secret _ _.
答
At last,they decided to keep the secret by themselves.
答
最后他们决定自己保守这个秘密.
At last,they ___ ___ ___ the secret ___ ___.
答案：decided to keep by themselves