Name two reasons the children were anxious to get back to Egypt after Ken's question was answered in The Egypt Game.

Everyone was anxious to get back to Egypt to see if April's question would be answered next.  Also, Marshall wanted to get back because he had lost his toy octopus, Security, and had "reason to believe that it had been left in Egypt the night before".  Melanie too had a special reason to be anxious to get back to Egypt.  Marshall would not quit perstering her about his lost octopus, so she wanted him to be able to have it back so he would leave her alone (Chapter 18 - "Where is Security?").