将下列3个句子组合成宾语从句的复合句
问题描述：
将下列3个句子组合成宾语从句的复合句
Did they have a good journey to Mount Tai?Mr Lee wants to know.
Is there going to be a food festival in our city?Do you know?
Is Lucy coming to the party It's still a secret.
答
Mr.Lee wants to know whether they had a good journey to Mount Tai.Do you know whether there is going to be a food festival in our city?It's still a secret whether Lucy is coming to the party.