根据句意和首字母完成单词。 1. John always s______ part of his pay each month. He wants to buy a cell phone with the money. 2. Maria is going to travel s______ interesting with her friends next time. 3. I hear the workers are b______ a subway in the city. 4. Paul wants to be an e______. He studies math very hard. 5. All the students of Class 2 made their New Year's r______ at the beginning of this term.