In winter, some people energy by lowing the heat at night.
举一反三
- It is a winter night ___he spent with me last night.
- It is a winter night ______ he spent with me last night. A: that B: where C: as D: when
- Some night clubs stay ___ late until deep into the night. (open, opened)
- It happened on ________ winter night.
- Heat energy and energy are the middle processes of energy transformation in an electric power plant.