They were students when they were in their( )

They were students when they were in their( ) They were doing their homework when I came in.改( 为否定句) They they were talking to their teacher.I saw the students.（用when When they were they were doing their homework when I came in.对画线句子提问 ______ Bread and butter ( ) their main food when they were liing in the fans were getting excited when they saw their favourit When they travelled in the forest,they were l( ) They __an earthquake when they were traveling in Sichuan pro The students in the dormitories were forbidden,unless they h oh when they were young when they were young 是什么意思?