| 1 | That fan makes a lot of noise, though. | |
| 2 | It is more comfortable than the electric fan. W: But a fan is not so dear as an air-conditioner. | |
| 3 | When not in a room, switch off the lights and the fan. | |
| 4 | Some students may forget to switch off the lights and fans in their classroom. | |
| 5 | For better air circulation, open a window or use a fan. |
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