The restaurant is nice and the food is not bad, _____________ I still prefer eating at home.

Never stand up ________ you are asked to.

David didn’t give up ______ he had failed in the experiment four times.

The Nanjing Yangtze River Bridge is still very strong, ___________ it is almost 43 years old.

--- Mr. Green, I think physics is too difficult for me.
---Tom, work hard, _______ you’ll find it not as difficult.

Mary spends a lot of money on clothes _____ her family is not rich.

Check again,           you’ll make fewer mistakes.

— When will you come to Daqing?
— I will call you _____I arrive.

— Hurry up, _____you will miss the school bus.
— I know that, Mum. I’ll be ready in a minute.

---Your classroom report is so wonderful.
---I wrote for 3 hours ___________ I finished it.