Was it at the Olympic Games ______ were held this year ______ Liu Xiang got a metal?

With the country’s population reaching 1.6 billion in the mid of this century, most of China’s rivers, including the Yellow River, ________

The manager was satisfied to see many new products ______ after great effort.

The students want to know ____ 1,600 words in a month.

You look so young. Haven’t you graduatedfrom your university—Yes, I________in the English Department ofShandong University for four years.