The shop owner suddenly stopped talking with his mouth like a big “O”. It was the President!
—What did our geography teacher say? —She told us that the earth _____ around the sun.
When we went into the park, we saw someone _____ Chinese Kungfu.
—How about going hiking this weekend? —Sorry, I prefer _____ rather than _____.
—Have you ever _____ Mudanjiang to see the Jingbo Lake? —Yes, I have.
My friend and I joined a program ______ Green China.