Many websites have been _______ to help people study foreign languages.

I don’t know when he______ tomorrow .When he_____ , I’ll let you know.

Travelling in space has been made __________ possible with the development of science and technology

We are now in senior three. I think it’s time we ______ more efforts for the college-entrance exams.

I hear the 2010 Shanghai Expo isheld __________ May 1st _________ Oct. 31st.