Помогите с номером по английскому языку,пожалуйста

4) Read this interview with an expert on transport in the future. Choose the correct options.

Interviewer: Good morning Doctor Lacey. In one of your articles you say we definitely won’t / may not have
cars by the end of the century. Why are you so certain?
Lacey: Actually I didn’t say that. I said we will definitely / definitely won’t have cars that use traditional
fuel. There isn’t enough oil in the world. But it’s difficult to say what we will use in its place.
We will / might use water or air, but it’s hard to predict.
Interviewer: What about planes? Do you think they will be able to / are able to fly without oil?
Lacey: Well, I think all cars will / might definitely fly in the future, so it’s possible that we may / may not
need planes in the future.
Interviewer: Really? When do you think this will happen?
Lacey: It probably won’t / definitely won’t happen in my lifetime – I have no doubt about that – but I
think my grandchildren will probably / probably won’t fly their cars to work.
Interviewer: And what about travel through time?
Lacey: No, that’s impossible. We won’t be able / may not be able to do that.