Can you think of any other machines that use engines?, Why is it important to wear safety equipment when playing sports or riding a bike?, Can you name a device that uses batteries?, What would our life be like if there was no electricity in the world?, Who discovered America and when? Who invented telephone and electricity and when? , What would our life be like if people didn`t invent the Internet. , What famous scientists do you know? What are they famous for? Would you like to be a scientist and why? , What steps does cooking past involves? , Why do animals become extinct? Can you name an animal that has become extinct in recent history?, Who is responsible for taking out the trash in your house? Who is responsible for taking care of your pet? What else are you responsible for in your house? , What happens if two cars collide with each other? How can we prevent it? , Is it easy for you to calculate? , Why are nuclear weapons so dangerous? , How can people develop their speaking skills in English? How can they develop their vocabulary skills? What skill would you like to develop? , What can cause a car accident? What can cause a fire? .

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