Answer: read
Explanation: Sources of light, heat, sound, and electricity are all extremely important to our daily lives.
Light sources such as the sun and light bulbs allow us to see and carry out our daily activities. Heat sources such as stoves, ovens, and heaters keep us warm and enable us to cook our food. Sound sources such as speakers and microphones allow us to communicate with each other, listen to music, and watch movies. Electricity powers our homes, businesses, and industries, and is essential for the functioning of many devices such as computers, phones, and refrigerators.
Without these sources of light, heat, sound, and electricity, our daily lives would be drastically different and much more difficult.