1-C. They build electric motors using everyday goods, such as wire, magnets, and paper clips.They build electric motors using everyday goods, such as wire, magnets, and paper clips.
2-C. Recently, even some electric can openers with multiple functions have been getting cheaper.Recently, even some electric can openers with multiple functions have been getting cheaper.
最近では、いくつかの電気缶オープナーさえもが、複数の機能を持つダヨ、さらに安くなってきていました。
3-C. However, with a manual can opener, even when there is an electric power failure, you can still open cans.However, with a manual can opener, even when there is an electric power failure, you can still open cans.
4-C. Can openers are needed to open some canned foods, and nowadays many people have easy-to-use electric ones.Can openers are needed to open some canned foods, and nowadays many people have easy-to-use electric ones.