The following chapters provide step-by-step instructions for practical _______ of genetic (基因)engineering to agriculture.

_____ May 27th,2008,millions of people watched the Beijing Torch Relay inNanjing. [ ]

We all know Jack Chen is a great actor, but ___________ of us remember when he was born.

The young trees should ______well as often as possible.

There is a bird ______ the tree. [ ]