Exercise 9. Underline the mistakes and correct them

4. Will bullet trains polluted the environment?
5. We will travel by teleporter soon although it is faster.
6. Bamboo copters will cheaper and easier to use.
7. Solar-powered ships will eco-friendly and comfortable.
8. I think she is use a driverless car with a smart navigation system.
9. SkyTrans may too expensive for students.
10. A solo wheel runs on electricity, so it is safely for the environment.