Zhong Nanshan, the famous medical scientist, has devoted most of his life useful ways in treating cough diseases.[ ]

They develop their skills _________ they can do things better and better.

________ May 27 th, 2008, millions of people watched the Beijing Olympic Torch Relay in Nanjing. [ ]

Mr Hu, can you tell us how to learn math well?—Sure. But remember nothing can be learned _______ hard work. [ ]

How was your birthday? — Very nice.— ______ yours, Maria? [ ]