The forty-first Expo was held May 1st 2010 in Shanghai. A. in B. on C. at
The MP3 _____ too much .He ____ 200 yuan _____ it .
—I am trying my best to learn English, but it doesn’t work well! —Don’t worry! Regard it _____ a big challenge!
I had a little trouble English grammar.
—How do you improve your listening skill, Mary? —I often do it _________ tapes and English radios.
I’m new at the party and I don’t have a friend ____.