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Rick has learned a lot about Chinese culture _____ he came to China.

Have sports training every day, ______you won’t be healthy in the future.

I have ever lived in New York and London, ______________I don't like either city.

___________ the car’s old, it still runs well.

My father was watching TV ______ my mother was cooking.
A. while    B. until    C. when

---My sister Sally had a bad cold. __________, she went to work as usual.
---She should go to see a doctor.

---- Don’t play with the knife, _______ you’ll cut yourself.
----Sorry, I_________ .

Money is important ______ it’s not the most important thing.

— Your aunt often walks the dog in the morning.
— Yeah, ___________ bad weather stops her.
A. when            B. unless            
C because           D. since

The twin sisters have learned a lot ________ they came to China.