When the millionaire was young, he was very poor. Only by doing part­time jobs during the summer holiday ________ afford to pay his college fees.

Look! So many colorful bicycles in two lines over there.—They’re for public. This kind of green smart traffic is ______ in big cities now.

．—Themovie 2012 will be on at home．

China is playing an important role the development of economy.

Is that ______ volleyball—Yes. Bill likes playing ______ volleyball. ______ volleyball is his.