The Secret Life of Pets: Farewells - Functional Language

Check the alternatives that the characters used to express farewell.

I'll see you tonight

Goodbye

Bye 

See you later

Have a good night

So long

See you

I'll miss  you

Sleep well

Later

Talk to a partner:

Which ones do you consider informal? 

Do you have a pet? Do you say goodbye to them when you leave home?

Do you act like the characters in the segment?