Complete the dialogue with proper words or sentences.

A: Hello! This is Lucy. ?

B: Yes, this is Li Lei speaking.

A: ?

B: I am watching a live program on CCTV 1. It's so exciting.

A: ?

B: It's about the experiments three astronauts are doing on the space station.

A: That's great. I'm interested in space, so I want to be an astronaut like them.

B: ?

A: I'm going to study science harder and take more exercise to make me stronger.

B: I hope your dream will come true.

A: .