`text{1. Why do people use a computer to control a robot?}`
⇒ Because a robot cannot think or do things alone.
`text{2. What can a robot help us?}`
⇒ It can help us save a lot of time and work.
`text{3. Are robots cheap or expensive?}`
⇒ They are very expensive.
`text{4.Do all people like robots?}`
⇒ No.