改错并解析原因。 1Those want to go hiking must tell our monitor after breakfast. 2The building has rebuilt twice. 3He suggested that you finished your homework first. 5Was it five o'clockthat he came back yesterday? 6The book is worth being read. 7He did everything hecould escape from the fire. 8He repeated his opinion in order to make himself understand. 9I would rather to walk than take a bus.