I knew nothing of the motives behind his recent move,and I don't know either the person to put him up to the action（）.

Just last week, for example, the World Health Organizat...

单项选择题Just last week, for example, the World Health Organization (WHO) announced the disturbing disclosure that SARS may be pretty deadlier than previously believed（）.

During many sectors are foundering, the $ 21 billion vi...

单项选择题During many sectors are foundering, the $ 21 billion videogame-software industry is booming, adding game developers at a rate of 2,500 a year in the United States alone（）.

I can still vividly remember to pick our steps in the m...

单项选择题I can still vividly remember to pick our steps in the mountain down the deep valley on my 21st birthday（）.