How many students are there in your class—There are forty-five students. One third of them are girls. ________ are boys.

It was already past midnight and only three young men _______ in the teahouse.

President Xi Jinping says Chinese government will do what it can against terrorism(恐怖主义).

I never dreamed of ______ such a big crowdhere.

Where to hold the 2012 Olympic Games was a subject ______ the Olympic Committee argued for a long time, and finally they voted for London.