根据句意及图片提示或汉语提示完成单词。
1. There are many _____ ( ) in the old house.
2. I often go to Beijing by _____ ( ) with my father.
3. Before you go online, you must connect the _____ ( ) to the computer.
4. Our teacher often _____ (检查) our homework in class.
5. The doctor _____ (挽救) many people's lives every year.
1. mice 2. train 3. monitor 4. checks 5. saves