A： Hi, David. 1.______ are you doing?
B： Hi, Mario. I am reading a book called Discovery.
A： What’s it 2.______?
B： It’s about the life in space.
A： Fantastic! Working in space is my dream. I’m going to be an astronaut * just like Yang Liwei.
B： Oh, great. 3.______ can you make it?
A： By studying hard and 4.______ more sports.
B： You know, it’s not easy to be an astronaut.
A： That’s 5.______ . But nothing is impossible. Anyway, I’ll try hard.
B： I hope your dream will come true.
A： Thank you!