1. How did Chuchu notice that his old master was in the subway?

- He could feel that his old master was there.

2. Think and talk about which person Chuchu should live.
- I think Chuchu should live with his old master because he had been with his old master for a long time and he wants to stay with his old master.

- I think Chuchu should live with the new master because she wanted to take Chuchu though he was blind and stray. His old master was so careless that he lost his pet.
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Would you check the passages above and correct errors? Thank you for your help.

All are okay.

1. How did Chuchu notice that his old master was in the subway?

- Chuchu noticed that his old master was in the subway because he recognized his scent or voice.

2. Think and talk about which person Chuchu should live with.
- In my opinion, Chuchu should live with his old master because they have a long history together and he likely has a stronger bond with him.

- On the other hand, some may argue that Chuchu should live with the new master. This is because the new master showed compassion by wanting to take care of Chuchu despite him being blind and a stray. Furthermore, it could be seen as the old master's fault for being careless and losing his pet.

Please note that the decision of who Chuchu should live with ultimately depends on personal preferences and individual circumstances.