Title: Nanjing.
Question: On what days did Nanjing have to issue a Red Alert because of the severe air pollution?

Title: Crucifixion of Jesus.
Question: Which writing detailed Jesus' appearance before ascension?

Title: Roman Republic.
Question: Which group of people conspired against Caesar in order to have him assassinated?

Title: Buckingham Palace.
Question:
What was located on the site that is now the Queen's Gallery?