作业帮在线求指导：根据汉语提示填入适当
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/16 09:00:47
在线求指导：根据汉语提示填入适当
| 根据汉语提示填入适当的单词. |
| 1.I think the calculator was _____ (发明) before the computer. 2.A stamp is used for _____ (寄) a letter. 3.Shoes with adjustable heels are used for _____ (改变) the style of the shoes? 4.What do you think is the most _____ (有用的) invention 5.I'm sorry I took your book by _____ (错误). |
1.invented 2.sending 3.changing 4.helpful 5.mistake