a) place, iron, lift, house, light, heat, use, form, change, wire
1. The conductor wires are placed high up.2. Electromagnets lift iron weights.3. The plastic box houses the conducting and the insulating elements of the apparatus.4. The house is lighted and heated by solar energy.5. The light went out. Light the candle, please.6. After the metal was heated it changed its colour to a red heat.7. Numerous changes are taking place in the uses of atomic energy.8. Electric power is used universally.9. The newly made invention has a great number of uses.