I told them not everybody could run as fast as you did, ________?[ ]

China, ____ one of the great four countries with ancient civilizations, is best-known _______ its great development in all the fields over the years.

Thank you for helping me so much—–______.

I don’t think Unit2 is more difficult. I think it’s _____.

I made some mistakes at the dinner tablelast night. — _______. I’ll tell you some table mannerslater.